1409-3871
1409-3871
S1409-38712021000200269
10.15517/lank.v21i2.48007
Ecuador
Ecuador
00
08
2021
00
08
2021
21
2
269
276
[
2019
19
3
3
271-9
]
[
2020
20
2
2
257-62
]
[
2018
18
3
3
231-7
]
[
1975
Third edition
385-448
]
[
1993
30-1
]
[
2017
17
1
1
55-60
]
[
2016
16
2
2
219-41
]
[
1980
47
57
]
[
1989
31
69-122
]
[
2012
19
107-13
]
[
2016
225
10-9
]
[
1983
70
8
8
1233-43
]
[
1876
6
138
138
226
]
[
2020
54
1-8
]