1390-6542
1390-6542
S1390-65422017000200056
10.29019/enfoqueute.v8n2.156
Ecuador
Ecuador
00
03
2017
00
03
2017
8
2
56
65
[
2011
]
[
1999
]
[
1997
3-17
]
[
1999
]
[
1997
86-90
]
[
2003
561-75
]
[
2006
]
[
2016
1575-89
]
[
2008
]
[
1992
]
[
2015
4797-806
]
[
2015
297-312
]
[
2015
2250-3
]
[
2014
1087-95
]
[
2015
47-64
]