0120-2812 0120-2812 S0120-28122007000100001 Colombia 00 03 2007 00 03 2007 56 1 1 6

2005 Vol. 169 No. 1 No. 1 355-73 2002 Vol. 162 No.1 No.1 365-6 2006 Vol. 55 No. 1 No. 1 15-21 1978 1979 667-78 1980 669-80 1999 216 2001