0185-1667 0185-1667 S0185-16672007000300155 Mexico 00 09 2007 00 09 2007 66 261 155 163 1974 82 6 6 1095-117 1981 1963 1986 76 3 3 297-313 1958 48 3 3 261-97 1982 14 2 2 171-204 2003