1390-6542
1390-6542
S1390-65422015000100035
10.29019/enfoqueute.v6n1.53
Cuba
Cuba
Ecuador
00
03
2015
00
03
2015
6
1
35
44
[
2013
13
1
1
402-14
]
[
2004
2
58-71
]
[
1970
153-227
]
[
2002
6
2
2
182-97
]
[
2005
273-316
]
[
2005
620
]
[
2009
]
[
2000
135-289
]
[
1978
478
]
[
2008
1-28
]
[
2004
1-4
]
[
2003
19
7-28
]
[
2013
7
4
4
90-9
]
[
2005
308
]