1390-6542
1390-6542
S1390-65422017000100232
10.29019/enfoqueute.v8n1.141
Colombia
Spain
Colombia
Colombia
Ecuador
00
02
2017
00
02
2017
8
232
243
[
1994
7
39-59
]
[
2011
421-34
]
[
2003
]
[
2008
22-4
]
[
1996
]
[
1996
]
[
2006
127-35
]
[
1998
273-97
]
[
2007
]
[
2006
]
[
1983
7
243-80
]
[
2004
5-35
]
[
2008
]
[
2008
28
275-85
]
[
2001
2001
883-8
]
[
2004
19
588-97
]
[
2012
]
[
2014
]
[
2013
962-7
]