1390-6542
1390-6542
S1390-65422020000400071
10.29019/enfoqueute.v11n4.663
Cuba
Cuba
Cuba
Cuba
00
12
2020
00
12
2020
11
4
71
86
[
2015
]
[
2018
]
[
2016
]
[
2014
]
[
2019
]
[
2018
]
[
2017
]
[
1986
]
[
2014
]
[
1976
]
[
2015
]
[
2019
]
[
1943
]
[
1983
]
[
2018
]
[
2020
]
[
2015
]
[
2015
]
[
2018
]
[
2016
]
[
2018
]
[
2004
]
[
2017
]
[
1970
]
[
2016
]
[
2017
]
[
2018
]
[
2019
]
[
2015
]
[
1936
]
[
2015
]
[
1983
]
[
2017
]
[
2020
]