0034-7744
0034-7744
S0034-77442018000100149
10.15517/rbt.v66i1.27612
Ecuador
Ecuador
Mexico
Ecuador
00
03
2018
00
03
2018
66
1
149
163
[
1988
20
3
3
178-84
]
[
2010
5
1
1
]
[
2011
27
17
17
2463-4
]
[
1982
14
2
2
158-60
]
[
1985
66
3
3
682-7
]
[
2000
15
5
5
183-8
]
[
1989
70
3
3
548-50
]
[
1983
]
[
2005
]
[
1993
]
[
2001
]
[
2001
142
1
1
39-60
]
[
2001
]
[
2007
315
5814
5814
972-6
]
[
2003
]
[
2012
29-83
]
[
2013
20
4
4
175-91
]
[
2008
96
4
4
807-20
]
[
2001
30
3
3
347-78
]
[
1979
28
1
1
100-8
]
[
1999
283
5401
5401
554-7
]
[
2002
417
6889
6889
636-8
]
[
2008
255
7
7
2163-76
]
[
2012
3th
]
[
1987
39
1
1
45-57
]
[
2002
32
2
2
247-54
]
[
1996
]
[
1994
10
03
03
385-98
]
[
R Core Team
2013
]
[
1999
47
1-5
]
[
2003
49
6
6
909-17
]
[
1986
2
03
03
277-82
]
[
2011
261
7
7
1143-51
]
[
2000
32
2
2
252-61
]
[
2012
170
1
1
263-74
]
[
1996
126
2
2
167-79
]
[
2003
]
[
1947
35
1/2
1/2
1-22
]
[
2015
10
10
10
]
[
2014
316
117-24
]
[
2011
68
2
2
385-94
]
[
1984
61
3
3
334-6
]
[
1991
72
1
1
35-50
]
[
1989
70
536-8
]