1390-6542
1390-6542
S1390-65422017000100016
10.29019/enfoqueute.v8n1.127
Ecuador
Ecuador
00
02
2017
00
02
2017
8
16
30
[
2009
429-38
]
[
2001
2
2
779-84
]
[
1986
679-98
]
[
2002
11
728-1220
]
[
2013
168-72
]
[
1998
20
7
7
699-716
]
[
2002
190
]
[
2007
25
5
5
652-62
]
[
2010
1
88-92
]
[
1980
207
187-217
]
[
2005
14
1
1
49-62
]
[
2013
1-6
]
[
1998
823-54
]
[
1970
814-6
]
[
2002
]
[
2009
29
A
A
962-1027
]
[
2005
43
3
3
433-40
]
[
2010
1
404
]
[
2012
6
7
7
839-53
]
[
2014
23
7
7
2944-60
]
[
1994
3
6
6
747 - 758
]
[
2010
27
9
9
3588-90
]