1727-897X 1727-897X S1727-897X2020000300431 Cuba Cuba 00 06 2020 00 06 2020 18 3 431 442

1 2020 93 211-6 2 2020 3 2020 4 2020 5 2020 323 14 14 1341-2 6 2020 7 2020 1 77-87 8 2020 9 2020 10 2020 11 2020 12 2016 13 DOE 2013 14 GNU 2018