2215-3411
2215-3411
S2215-34112019000300119
10.15517/ijds.2019.38364
Ecuador
Ecuador
00
12
2019
00
12
2019
21
3
119
126
[
2010
23
2
2
73-78.
]
[
2007
]
[
2013
15
3
3
306-311.
]
[
2007
]
[
2010
]
[
2012
25
1
1
44-51.
]
[
2010
2nd Edition
]
[
2010
138
4.
4.
]
[
2003
37
11
11
599-606.
]
[
2004
74
3
3
304-315.
]
[
2018
6
2
2
98-111.
]
[
1981
79
115-33
]
[
2007
]