1405-3195 1405-3195 S1405-31952007000500503 Mexico 00 08 2007 00 08 2007 41 5 503 511

AWWA 1988 1-140 1992 13 2951-6 1993 175 175 7488-91 2000 63 123-5 2002 68 2822-8 2002 81 249-59 2001 606 181-8 2004 76 40-7 2002 68 3169-71 1997 113 327-34