2414-8938
2414-8938
S2414-89382019000100071
10.30545/academo.2019.ene-jun.8
Spain
Paraguay
00
06
2019
00
06
2019
6
1
71
80
[
2012
10
3
3
99-123
]
[
2012
3
7
7
23-40
]
[
1997
]
[
2001
]
[
2012
31
1
1
65-77
]
[
2003
]
[
2014
15
2
2
131-51
]
[
2012
115
6
6
32-40
]
[
2014
]
[
2015
31
77
77
95-110
]
[
2013
14
1
1
104-17
]
[
2013
34
1
1
83-96
]
[
1979
]
[
1979
]
[
1997
]
[
2003
]
[
2013
]
[
1976
]
[
1993
pp. 146-56
]
[
1983
]
[
2012
49
7
7
706-15
]
[
2012
60
4
4
623-38
]
[
2015
38
4
4
619-20
]
[
2014
39
8
8
1439-50
]
[
1999
]
[
1994
]
[
2014
20
31
31
9-18
]
[
2014
43
169
169
25-45
]
[
2012
1
2
2
74-9
]
[
2014
67
2
2
127-40
]
[
2013
65
1
1
25-37
]
[
2014
5
12
12
88-103
]
[
2014
83
4
4
598
]
[
2002
]
[
1996
]
[
RAND Corporation
2014
]
[
2014
a
]
[
2014
b
]
[
2014
c
]
[
2016
]
[
1989
]
[
2014
15
8-33
]
[
2012
31
22
22
20-2
]
[
1982
]
[
1992
]
[
1984
]
[
2012
37
3
3
213-9
]
[
2013
]
[
2013
16
2
2
21-30
]
[
2015
40
40
253-9
]
[
2016
40
1
1
83-106
]
[
2014
]
[
2014
40
4
4
466-81
]
[
2010
]
[
2015
60
10-1
]