1390-6542
1390-6542
S1390-65422018000200159
10.29019/enfoqueute.v9n2.185
Ecuador
00
06
2018
00
06
2018
9
2
159
174
[
ASME
2013
]
[
2014
]
[
ECUADOR, PRO
2013
]
[
ECUADOR, PRO
2015
]
[
2015
]
[
2017
]
[
2012
]
[
2004
]
[
1999
]
[
2010
]
[
2016
]
[
2013
]
[
2003
39
1
1
115-23
]
[
2010
70
4
4
633-9
]
[
2009
]
[
2007
]
[
2012
]
[
2002
]
[
2009
]
[
2015
]
[
2016
19
1
1
30-9
]
[
2014
]
[
2014
34
4
4
649-56
]
[
2012
]