"MODIFICA DECRETO NO. 231, DE 1981"^^ . "MODIFICA DECRETO NO. 231, DE 1981"^^ . "1986-11-26"^^ . . "1987-09-28"^^ . . . . . . "1"^^ . . "1987-09-28"^^ . "es"^^ . "145806"^^ . . "346"^^ .