1990-8644 1990-8644 S1990-86442018000300274 Cuba 00 06 2018 00 06 2018 14 63 274 278

(198 5) 21 1 1 37-46 (200 9) (201 4) (201 3) (200 2) (201 1) (201 0) (201 2) (201 2) (200 7) (200 5) (201 3) (199 4) (200 5) (201 2) (200 8) Unión de Repúblicas Socialistas Soviéticas (197 9) (197 9)