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2005 451-77 2000 2000 2003 1997 1996 2000 2001 2001 2005 xiii-xix 2006 1996 2002 1998 1996 American Association for Artificial Inteligence 2001 349-75 2005 79 79 69-84 2007 México, D.F. 1997 2001 1999