0188-6649 0188-6649 S0188-66492005000100305 10.21555/top.v28i1.237 Colombia 00 00 2005 00 00 2005 28 305 326 1953 1968 2 2003 1973 1 2000 1984 4 1984 45 2000 1983 37 181-98 1968 1954 2001 1973 2002 1983 2002 1993 1997 4 87-102 2002 66 577-605