1990-8644 1990-8644 S1990-86442020000600201 Cuba 00 12 2020 00 12 2020 16 77 201 208

2017 2020 18 1 1 5-21 2019 2017 25 50 50 43-52 2011 Cuba. Ministerio de Educación Superior 2016 2015 6 32 32 2016 3 1 1 1-26 2020 24 2 2 1-19 2016 12 12 12 29-50 2019 2006 2 2 2 2006