1028-4818 1028-4818 S1028-48182020000100102 Cuba Cuba Cuba Cuba 00 02 2020 00 02 2020 24 1 102 118

1 2003 2 2016 17 1 1 17-23 3 2013 42 3 3 396-402 4 2012 5 2017 39 3 3 640-9 6 2002 7 2014 16 1 1 20-7 8 2018 60 2 2 9 2017 28-9 10 2019 79 2 2 248-60 11 2011 12 1 1 16-20 12 2015 13 Cuba Ministerio de Educación 2013 14 1997