URL List

https://dspace.unl.edu.ec//handle/123456789/19833
https://dspace.unl.edu.ec//handle/123456789/19789
https://dspace.unl.edu.ec//handle/123456789/19819
https://dspace.unl.edu.ec//handle/123456789/19842
https://dspace.unl.edu.ec//handle/123456789/19765
https://dspace.unl.edu.ec//handle/123456789/19784
https://dspace.unl.edu.ec//handle/123456789/19780
https://dspace.unl.edu.ec//handle/123456789/19816
https://dspace.unl.edu.ec//handle/123456789/19808
https://dspace.unl.edu.ec//handle/123456789/19804
https://dspace.unl.edu.ec//handle/123456789/19791
https://dspace.unl.edu.ec//handle/123456789/19773
https://dspace.unl.edu.ec//handle/123456789/19839
https://dspace.unl.edu.ec//handle/123456789/19812
https://dspace.unl.edu.ec//handle/123456789/19767
https://dspace.unl.edu.ec//handle/123456789/19825
https://dspace.unl.edu.ec//handle/123456789/19774
https://dspace.unl.edu.ec//handle/123456789/19785
https://dspace.unl.edu.ec//handle/123456789/19805
https://dspace.unl.edu.ec//handle/123456789/19820
https://dspace.unl.edu.ec//handle/123456789/19792
https://dspace.unl.edu.ec//handle/123456789/19786
https://dspace.unl.edu.ec//handle/123456789/19801
https://dspace.unl.edu.ec//handle/123456789/19813
https://dspace.unl.edu.ec//handle/123456789/19809
https://dspace.unl.edu.ec//handle/123456789/19835
https://dspace.unl.edu.ec//handle/123456789/19831
https://dspace.unl.edu.ec//handle/123456789/19806
https://dspace.unl.edu.ec//handle/123456789/19817
https://dspace.unl.edu.ec//handle/123456789/19794
https://dspace.unl.edu.ec//handle/123456789/19854
https://dspace.unl.edu.ec//handle/123456789/19802
https://dspace.unl.edu.ec//handle/123456789/19814
https://dspace.unl.edu.ec//handle/123456789/19828
https://dspace.unl.edu.ec//handle/123456789/19821
https://dspace.unl.edu.ec//handle/123456789/19810
https://dspace.unl.edu.ec//handle/123456789/19807
https://dspace.unl.edu.ec//handle/123456789/19826
https://dspace.unl.edu.ec//handle/123456789/19837
https://dspace.unl.edu.ec//handle/123456789/19850
https://dspace.unl.edu.ec//handle/123456789/19845
https://dspace.unl.edu.ec//handle/123456789/19832
https://dspace.unl.edu.ec//handle/123456789/19853
https://dspace.unl.edu.ec//handle/123456789/19847
https://dspace.unl.edu.ec//handle/123456789/19843
https://dspace.unl.edu.ec//handle/123456789/19841
https://dspace.unl.edu.ec//handle/123456789/19838
https://dspace.unl.edu.ec//handle/123456789/19857
https://dspace.unl.edu.ec//handle/123456789/19851
https://dspace.unl.edu.ec//handle/123456789/19849
https://dspace.unl.edu.ec//handle/123456789/19866
https://dspace.unl.edu.ec//handle/123456789/19856
https://dspace.unl.edu.ec//handle/123456789/19844
https://dspace.unl.edu.ec//handle/123456789/19852
https://dspace.unl.edu.ec//handle/123456789/19848
https://dspace.unl.edu.ec//handle/123456789/19846
https://dspace.unl.edu.ec//handle/123456789/19861
https://dspace.unl.edu.ec//handle/123456789/19855
https://dspace.unl.edu.ec//handle/123456789/19868
https://dspace.unl.edu.ec//handle/123456789/19867
https://dspace.unl.edu.ec//handle/123456789/19860
https://dspace.unl.edu.ec//handle/123456789/19862
https://dspace.unl.edu.ec//handle/123456789/19859
https://dspace.unl.edu.ec//handle/123456789/19863
https://dspace.unl.edu.ec//handle/123456789/19840
https://dspace.unl.edu.ec//handle/123456789/19864
https://dspace.unl.edu.ec//handle/123456789/20760
https://dspace.unl.edu.ec//handle/123456789/20742
https://dspace.unl.edu.ec//handle/123456789/20788
https://dspace.unl.edu.ec//handle/123456789/18490
https://dspace.unl.edu.ec//handle/123456789/20764
https://dspace.unl.edu.ec//handle/123456789/20751
https://dspace.unl.edu.ec//handle/123456789/19865
https://dspace.unl.edu.ec//handle/123456789/20743
https://dspace.unl.edu.ec//handle/123456789/20806
https://dspace.unl.edu.ec//handle/123456789/20752
https://dspace.unl.edu.ec//handle/123456789/20756
https://dspace.unl.edu.ec//handle/123456789/19871
https://dspace.unl.edu.ec//handle/123456789/20744
https://dspace.unl.edu.ec//handle/123456789/22576
https://dspace.unl.edu.ec//handle/123456789/20772
https://dspace.unl.edu.ec//handle/123456789/20768
https://dspace.unl.edu.ec//handle/123456789/20812
https://dspace.unl.edu.ec//handle/123456789/20761
https://dspace.unl.edu.ec//handle/123456789/19877
https://dspace.unl.edu.ec//handle/123456789/21755
https://dspace.unl.edu.ec//handle/123456789/22575
https://dspace.unl.edu.ec//handle/123456789/20745
https://dspace.unl.edu.ec//handle/123456789/20791
https://dspace.unl.edu.ec//handle/123456789/20753
https://dspace.unl.edu.ec//handle/123456789/20776
https://dspace.unl.edu.ec//handle/123456789/20757
https://dspace.unl.edu.ec//handle/123456789/19878
https://dspace.unl.edu.ec//handle/123456789/20754
https://dspace.unl.edu.ec//handle/123456789/20798
https://dspace.unl.edu.ec//handle/123456789/20746
https://dspace.unl.edu.ec//handle/123456789/22577
https://dspace.unl.edu.ec//handle/123456789/20795
https://dspace.unl.edu.ec//handle/123456789/19884
https://dspace.unl.edu.ec//handle/123456789/20786
https://dspace.unl.edu.ec//handle/123456789/20780
https://dspace.unl.edu.ec//handle/123456789/20741
https://dspace.unl.edu.ec//handle/123456789/20748
https://dspace.unl.edu.ec//handle/123456789/20783
https://dspace.unl.edu.ec//handle/123456789/20762
https://dspace.unl.edu.ec//handle/123456789/20769
https://dspace.unl.edu.ec//handle/123456789/20758
https://dspace.unl.edu.ec//handle/123456789/20773
https://dspace.unl.edu.ec//handle/123456789/20765
https://dspace.unl.edu.ec//handle/123456789/20759
https://dspace.unl.edu.ec//handle/123456789/20777
https://dspace.unl.edu.ec//handle/123456789/20789
https://dspace.unl.edu.ec//handle/123456789/20770
https://dspace.unl.edu.ec//handle/123456789/20766
https://dspace.unl.edu.ec//handle/123456789/20755
https://dspace.unl.edu.ec//handle/123456789/20763
https://dspace.unl.edu.ec//handle/123456789/20774
https://dspace.unl.edu.ec//handle/123456789/20781
https://dspace.unl.edu.ec//handle/123456789/20794
https://dspace.unl.edu.ec//handle/123456789/20784
https://dspace.unl.edu.ec//handle/123456789/20771
https://dspace.unl.edu.ec//handle/123456789/20767
https://dspace.unl.edu.ec//handle/123456789/20778
https://dspace.unl.edu.ec//handle/123456789/20787
https://dspace.unl.edu.ec//handle/123456789/20792
https://dspace.unl.edu.ec//handle/123456789/20775
https://dspace.unl.edu.ec//handle/123456789/20801
https://dspace.unl.edu.ec//handle/123456789/20803
https://dspace.unl.edu.ec//handle/123456789/20790
https://dspace.unl.edu.ec//handle/123456789/20796
https://dspace.unl.edu.ec//handle/123456789/20779
https://dspace.unl.edu.ec//handle/123456789/20785
https://dspace.unl.edu.ec//handle/123456789/20782
https://dspace.unl.edu.ec//handle/123456789/20809
https://dspace.unl.edu.ec//handle/123456789/20808
https://dspace.unl.edu.ec//handle/123456789/20799
https://dspace.unl.edu.ec//handle/123456789/20805
https://dspace.unl.edu.ec//handle/123456789/20793
https://dspace.unl.edu.ec//handle/123456789/20814
https://dspace.unl.edu.ec//handle/123456789/20810
https://dspace.unl.edu.ec//handle/123456789/20807
https://dspace.unl.edu.ec//handle/123456789/20797
https://dspace.unl.edu.ec//handle/123456789/20813
https://dspace.unl.edu.ec//handle/123456789/20802
https://dspace.unl.edu.ec//handle/123456789/20800
https://dspace.unl.edu.ec//handle/123456789/20811
https://dspace.unl.edu.ec//handle/123456789/20804
https://dspace.unl.edu.ec//handle/123456789/18513
https://dspace.unl.edu.ec//handle/123456789/19914
https://dspace.unl.edu.ec//handle/123456789/19873
https://dspace.unl.edu.ec//handle/123456789/19893
https://dspace.unl.edu.ec//handle/123456789/19890
https://dspace.unl.edu.ec//handle/123456789/18504
https://dspace.unl.edu.ec//handle/123456789/18498
https://dspace.unl.edu.ec//handle/123456789/19896
https://dspace.unl.edu.ec//handle/123456789/18492
https://dspace.unl.edu.ec//handle/123456789/18545
https://dspace.unl.edu.ec//handle/123456789/19883
https://dspace.unl.edu.ec//handle/123456789/18526
https://dspace.unl.edu.ec//handle/123456789/18520
https://dspace.unl.edu.ec//handle/123456789/19899
https://dspace.unl.edu.ec//handle/123456789/18499
https://dspace.unl.edu.ec//handle/123456789/18493
https://dspace.unl.edu.ec//handle/123456789/19879
https://dspace.unl.edu.ec//handle/123456789/18536
https://dspace.unl.edu.ec//handle/123456789/18527
https://dspace.unl.edu.ec//handle/123456789/18505
https://dspace.unl.edu.ec//handle/123456789/18514
https://dspace.unl.edu.ec//handle/123456789/19880
https://dspace.unl.edu.ec//handle/123456789/19888
https://dspace.unl.edu.ec//handle/123456789/18515
https://dspace.unl.edu.ec//handle/123456789/18500
https://dspace.unl.edu.ec//handle/123456789/19869
https://dspace.unl.edu.ec//handle/123456789/19897
https://dspace.unl.edu.ec//handle/123456789/18509
https://dspace.unl.edu.ec//handle/123456789/18494
https://dspace.unl.edu.ec//handle/123456789/19923
https://dspace.unl.edu.ec//handle/123456789/18521
https://dspace.unl.edu.ec//handle/123456789/19894
https://dspace.unl.edu.ec//handle/123456789/19874
https://dspace.unl.edu.ec//handle/123456789/19922
https://dspace.unl.edu.ec//handle/123456789/18495
https://dspace.unl.edu.ec//handle/123456789/19870
https://dspace.unl.edu.ec//handle/123456789/18501
https://dspace.unl.edu.ec//handle/123456789/18531
https://dspace.unl.edu.ec//handle/123456789/19885
https://dspace.unl.edu.ec//handle/123456789/18539
https://dspace.unl.edu.ec//handle/123456789/18516
https://dspace.unl.edu.ec//handle/123456789/18512
https://dspace.unl.edu.ec//handle/123456789/19907
https://dspace.unl.edu.ec//handle/123456789/18496
https://dspace.unl.edu.ec//handle/123456789/19872
https://dspace.unl.edu.ec//handle/123456789/21756
https://dspace.unl.edu.ec//handle/123456789/19891
https://dspace.unl.edu.ec//handle/123456789/18523
https://dspace.unl.edu.ec//handle/123456789/18502
https://dspace.unl.edu.ec//handle/123456789/19902
https://dspace.unl.edu.ec//handle/123456789/19875
https://dspace.unl.edu.ec//handle/123456789/18497
https://dspace.unl.edu.ec//handle/123456789/18517
https://dspace.unl.edu.ec//handle/123456789/18532
https://dspace.unl.edu.ec//handle/123456789/18503
https://dspace.unl.edu.ec//handle/123456789/19889
https://dspace.unl.edu.ec//handle/123456789/19881
https://dspace.unl.edu.ec//handle/123456789/18542
https://dspace.unl.edu.ec//handle/123456789/19886
https://dspace.unl.edu.ec//handle/123456789/19876
https://dspace.unl.edu.ec//handle/123456789/18525
https://dspace.unl.edu.ec//handle/123456789/19882
https://dspace.unl.edu.ec//handle/123456789/19909
https://dspace.unl.edu.ec//handle/123456789/18518
https://dspace.unl.edu.ec//handle/123456789/19905
https://dspace.unl.edu.ec//handle/123456789/19900
https://dspace.unl.edu.ec//handle/123456789/19895
https://dspace.unl.edu.ec//handle/123456789/19892
https://dspace.unl.edu.ec//handle/123456789/19898
https://dspace.unl.edu.ec//handle/123456789/18544
https://dspace.unl.edu.ec//handle/123456789/18535
https://dspace.unl.edu.ec//handle/123456789/19919
https://dspace.unl.edu.ec//handle/123456789/19887
https://dspace.unl.edu.ec//handle/123456789/19916
https://dspace.unl.edu.ec//handle/123456789/19911
https://dspace.unl.edu.ec//handle/123456789/19925
https://dspace.unl.edu.ec//handle/123456789/19903
https://dspace.unl.edu.ec//handle/123456789/19913
https://dspace.unl.edu.ec//handle/123456789/19908
https://dspace.unl.edu.ec//handle/123456789/19901
https://dspace.unl.edu.ec//handle/123456789/19924
https://dspace.unl.edu.ec//handle/123456789/19906
https://dspace.unl.edu.ec//handle/123456789/19915
https://dspace.unl.edu.ec//handle/123456789/19904
https://dspace.unl.edu.ec//handle/123456789/19918
https://dspace.unl.edu.ec//handle/123456789/19910
https://dspace.unl.edu.ec//handle/123456789/19926
https://dspace.unl.edu.ec//handle/123456789/19936
https://dspace.unl.edu.ec//handle/123456789/19912
https://dspace.unl.edu.ec//handle/123456789/19921
https://dspace.unl.edu.ec//handle/123456789/19917
https://dspace.unl.edu.ec//handle/123456789/19930
https://dspace.unl.edu.ec//handle/123456789/19927
https://dspace.unl.edu.ec//handle/123456789/19920
https://dspace.unl.edu.ec//handle/123456789/19928
https://dspace.unl.edu.ec//handle/123456789/19934
https://dspace.unl.edu.ec//handle/123456789/19929
https://dspace.unl.edu.ec//handle/123456789/19932
https://dspace.unl.edu.ec//handle/123456789/19931
https://dspace.unl.edu.ec//handle/123456789/19933
https://dspace.unl.edu.ec//handle/123456789/19937
https://dspace.unl.edu.ec//handle/123456789/19935
https://dspace.unl.edu.ec//handle/123456789/19939
https://dspace.unl.edu.ec//handle/123456789/19938
https://dspace.unl.edu.ec//handle/123456789/21168
https://dspace.unl.edu.ec//handle/123456789/20837
https://dspace.unl.edu.ec//handle/123456789/18534
https://dspace.unl.edu.ec//handle/123456789/19940
https://dspace.unl.edu.ec//handle/123456789/21180
https://dspace.unl.edu.ec//handle/123456789/21164
https://dspace.unl.edu.ec//handle/123456789/18506
https://dspace.unl.edu.ec//handle/123456789/21184
https://dspace.unl.edu.ec//handle/123456789/21201
https://dspace.unl.edu.ec//handle/123456789/18507
https://dspace.unl.edu.ec//handle/123456789/19941
https://dspace.unl.edu.ec//handle/123456789/20840
https://dspace.unl.edu.ec//handle/123456789/21173
https://dspace.unl.edu.ec//handle/123456789/21158
https://dspace.unl.edu.ec//handle/123456789/21169
https://dspace.unl.edu.ec//handle/123456789/18508
https://dspace.unl.edu.ec//handle/123456789/21191
https://dspace.unl.edu.ec//handle/123456789/21165
https://dspace.unl.edu.ec//handle/123456789/19951
https://dspace.unl.edu.ec//handle/123456789/21757
https://dspace.unl.edu.ec//handle/123456789/21177
https://dspace.unl.edu.ec//handle/123456789/20841
https://dspace.unl.edu.ec//handle/123456789/22967
https://dspace.unl.edu.ec//handle/123456789/21181
https://dspace.unl.edu.ec//handle/123456789/18510
https://dspace.unl.edu.ec//handle/123456789/22578
https://dspace.unl.edu.ec//handle/123456789/21159
https://dspace.unl.edu.ec//handle/123456789/21206
https://dspace.unl.edu.ec//handle/123456789/21152
https://dspace.unl.edu.ec//handle/123456789/21194
https://dspace.unl.edu.ec//handle/123456789/21174
https://dspace.unl.edu.ec//handle/123456789/21160
https://dspace.unl.edu.ec//handle/123456789/21170
https://dspace.unl.edu.ec//handle/123456789/21166
https://dspace.unl.edu.ec//handle/123456789/18511
https://dspace.unl.edu.ec//handle/123456789/10517
https://dspace.unl.edu.ec//handle/123456789/20816
https://dspace.unl.edu.ec//handle/123456789/21204
https://dspace.unl.edu.ec//handle/123456789/21219
https://dspace.unl.edu.ec//handle/123456789/21162
https://dspace.unl.edu.ec//handle/123456789/21154
https://dspace.unl.edu.ec//handle/123456789/21185
https://dspace.unl.edu.ec//handle/123456789/18528
https://dspace.unl.edu.ec//handle/123456789/21178
https://dspace.unl.edu.ec//handle/123456789/21197
https://dspace.unl.edu.ec//handle/123456789/21167
https://dspace.unl.edu.ec//handle/123456789/20836
https://dspace.unl.edu.ec//handle/123456789/21182
https://dspace.unl.edu.ec//handle/123456789/21171
https://dspace.unl.edu.ec//handle/123456789/21156
https://dspace.unl.edu.ec//handle/123456789/21175
https://dspace.unl.edu.ec//handle/123456789/21163
https://dspace.unl.edu.ec//handle/123456789/21199
https://dspace.unl.edu.ec//handle/123456789/21192
https://dspace.unl.edu.ec//handle/123456789/21189
https://dspace.unl.edu.ec//handle/123456789/21179
https://dspace.unl.edu.ec//handle/123456789/21211
https://dspace.unl.edu.ec//handle/123456789/21172
https://dspace.unl.edu.ec//handle/123456789/21216
https://dspace.unl.edu.ec//handle/123456789/21186
https://dspace.unl.edu.ec//handle/123456789/21183
https://dspace.unl.edu.ec//handle/123456789/21195
https://dspace.unl.edu.ec//handle/123456789/21176
https://dspace.unl.edu.ec//handle/123456789/21202
https://dspace.unl.edu.ec//handle/123456789/21209
https://dspace.unl.edu.ec//handle/123456789/21198
https://dspace.unl.edu.ec//handle/123456789/21187
https://dspace.unl.edu.ec//handle/123456789/21213
https://dspace.unl.edu.ec//handle/123456789/21193
https://dspace.unl.edu.ec//handle/123456789/21222
https://dspace.unl.edu.ec//handle/123456789/21200
https://dspace.unl.edu.ec//handle/123456789/21207
https://dspace.unl.edu.ec//handle/123456789/21218
https://dspace.unl.edu.ec//handle/123456789/21196
https://dspace.unl.edu.ec//handle/123456789/21203
https://dspace.unl.edu.ec//handle/123456789/21232
https://dspace.unl.edu.ec//handle/123456789/21212
https://dspace.unl.edu.ec//handle/123456789/21210
https://dspace.unl.edu.ec//handle/123456789/21221
https://dspace.unl.edu.ec//handle/123456789/21208
https://dspace.unl.edu.ec//handle/123456789/21225
https://dspace.unl.edu.ec//handle/123456789/21215
https://dspace.unl.edu.ec//handle/123456789/21217
https://dspace.unl.edu.ec//handle/123456789/21214
https://dspace.unl.edu.ec//handle/123456789/21227
https://dspace.unl.edu.ec//handle/123456789/21220
https://dspace.unl.edu.ec//handle/123456789/21224
https://dspace.unl.edu.ec//handle/123456789/21226
https://dspace.unl.edu.ec//handle/123456789/21233
https://dspace.unl.edu.ec//handle/123456789/21228
https://dspace.unl.edu.ec//handle/123456789/21223
https://dspace.unl.edu.ec//handle/123456789/21229
https://dspace.unl.edu.ec//handle/123456789/21205
https://dspace.unl.edu.ec//handle/123456789/21230
https://dspace.unl.edu.ec//handle/123456789/21234
https://dspace.unl.edu.ec//handle/123456789/21231
https://dspace.unl.edu.ec//handle/123456789/21157
https://dspace.unl.edu.ec//handle/123456789/18538
https://dspace.unl.edu.ec//handle/123456789/19957
https://dspace.unl.edu.ec//handle/123456789/20013
https://dspace.unl.edu.ec//handle/123456789/19969
https://dspace.unl.edu.ec//handle/123456789/19975
https://dspace.unl.edu.ec//handle/123456789/19982
https://dspace.unl.edu.ec//handle/123456789/19966
https://dspace.unl.edu.ec//handle/123456789/19946
https://dspace.unl.edu.ec//handle/123456789/18519
https://dspace.unl.edu.ec//handle/123456789/19942
https://dspace.unl.edu.ec//handle/123456789/18546
https://dspace.unl.edu.ec//handle/123456789/19962
https://dspace.unl.edu.ec//handle/123456789/19952
https://dspace.unl.edu.ec//handle/123456789/19943
https://dspace.unl.edu.ec//handle/123456789/19958
https://dspace.unl.edu.ec//handle/123456789/18522
https://dspace.unl.edu.ec//handle/123456789/19947
https://dspace.unl.edu.ec//handle/123456789/19953
https://dspace.unl.edu.ec//handle/123456789/19995
https://dspace.unl.edu.ec//handle/123456789/19980
https://dspace.unl.edu.ec//handle/123456789/19948
https://dspace.unl.edu.ec//handle/123456789/21758
https://dspace.unl.edu.ec//handle/123456789/18547
https://dspace.unl.edu.ec//handle/123456789/19990
https://dspace.unl.edu.ec//handle/123456789/18524
https://dspace.unl.edu.ec//handle/123456789/19954
https://dspace.unl.edu.ec//handle/123456789/20019
https://dspace.unl.edu.ec//handle/123456789/19970
https://dspace.unl.edu.ec//handle/123456789/19963
https://dspace.unl.edu.ec//handle/123456789/19974
https://dspace.unl.edu.ec//handle/123456789/18548
https://dspace.unl.edu.ec//handle/123456789/18530
https://dspace.unl.edu.ec//handle/123456789/19977
https://dspace.unl.edu.ec//handle/123456789/19949
https://dspace.unl.edu.ec//handle/123456789/19945
https://dspace.unl.edu.ec//handle/123456789/19959
https://dspace.unl.edu.ec//handle/123456789/19955
https://dspace.unl.edu.ec//handle/123456789/19967
https://dspace.unl.edu.ec//handle/123456789/18537
https://dspace.unl.edu.ec//handle/123456789/19997
https://dspace.unl.edu.ec//handle/123456789/18549
https://dspace.unl.edu.ec//handle/123456789/19999
https://dspace.unl.edu.ec//handle/123456789/19983
https://dspace.unl.edu.ec//handle/123456789/19971
https://dspace.unl.edu.ec//handle/123456789/19964
https://dspace.unl.edu.ec//handle/123456789/19956
https://dspace.unl.edu.ec//handle/123456789/18550
https://dspace.unl.edu.ec//handle/123456789/19950
https://dspace.unl.edu.ec//handle/123456789/19986
https://dspace.unl.edu.ec//handle/123456789/19981
https://dspace.unl.edu.ec//handle/123456789/19960
https://dspace.unl.edu.ec//handle/123456789/19968
https://dspace.unl.edu.ec//handle/123456789/19965
https://dspace.unl.edu.ec//handle/123456789/19978
https://dspace.unl.edu.ec//handle/123456789/19961
https://dspace.unl.edu.ec//handle/123456789/20002
https://dspace.unl.edu.ec//handle/123456789/19972
https://dspace.unl.edu.ec//handle/123456789/19992
https://dspace.unl.edu.ec//handle/123456789/19984
https://dspace.unl.edu.ec//handle/123456789/19979
https://dspace.unl.edu.ec//handle/123456789/19989
https://dspace.unl.edu.ec//handle/123456789/19976
https://dspace.unl.edu.ec//handle/123456789/19994
https://dspace.unl.edu.ec//handle/123456789/19988
https://dspace.unl.edu.ec//handle/123456789/20001
https://dspace.unl.edu.ec//handle/123456789/19996