1409-3871
1409-3871
S1409-38712017000200245
10.15517/lank.v17i2.30112
Ecuador
Ecuador
Ecuador
00
08
2017
00
08
2017
17
2
245
250
[
2011
62
3
3
230-1
]
[
2003
]
[
2004
]
[
2017
17
1
1
55-60
]
[
1999
75
]
[
2016
272
1
1
1-36
]
[
2016
16
2
2
219-41
]
[
2012
]
[
1990
38
1-132
]
[
1994
52
121
]
[
2010
120
145
]
[
2011
126
]
[
2005
42
]