1608-8921 1608-8921 S1608-89212019000200032 Cuba Cuba 00 08 2019 00 08 2019 21 2 32 40

1 Cuba. Ministerio de Educación Superior 1988 2 2003 8 1 1 54-60 3 2016 4 2019 25 1 1 39-52 5 2018 24 4 4 6 2018 24 4 4 7 2012 8 2016 5 19 19 155-63