1405-3195 1405-3195 S1405-31952006000100077 Chile Chile 00 02 2006 00 02 2006 40 1 77 88

1986 50 8 8 16 1993 1984 175 4529 4529 22-7 1993 423-54 1993 1989 1996 65 2 2 339-47 Michigan State University Extensión 1996 Microcal Software INC 2000 509-94 1993 391-422 1999 123-7 1992 210 1990 2001 SAS Institute 2004 1999 34-43 1999