1390-6542
1390-6542
S1390-65422014000400034
10.29019/enfoqueute.v5n4.46
Ecuador
Ecuador
00
12
2014
00
12
2014
5
4
34
53
[
2013
]
[
2013
37
3
3
121-36
]
[
2014
]
[
2013
]
[
2011
]
[
2012
1-43
]
[
2012
]
[
2014
]
[
2014
1-10
]
[
2011
]
[
2009
]
[
1999
ACM
]
[
2013
1883-9
]
[
2014
12
1
1
17-22
]
[
2014
]
[
1954
47
6
6
381-91
]
[
2013
]
[
2014
]
[
2014
]
[
2014
74
37-49
]
[
2011
1
5
5
365-70
]
[
2013
]
[
2011
10
45
45
]
[
2012
]
[
2004
]
[
2014
457-61
]
[
2003
]
[
2011
]
[
2013
8
1
1
5-19
]
[
2014
]
[
2003
27-54
]
[
2014
]
[
1992
75-104
]
[
Microsoft Corporation
2013
]
[
2007
37
3
3
311-24
]
[
2013
]
[
2011
69
9
9
551-62
]
[
1994
23-48
]
[
1995
]
[
2004
409-20
]
[
2010
17
3
3
6-10
]
[
2013
]
[
2012
]
[
2012
]
[
2013
37
3
3
101-20
]
[
2012
]
[
2002
]
[
2013
]
[
2013
732-47
]
[
2011
]
[
2011
]
[
2013
33
2
2
61-70
]
[
2013
]
[
2012
]
[
2014
]
[
2009
]
[
2012
]
[
2011
]
[
2012
990-4
]