00355nam a2200133Ia 4500020001500000082001900015100002200034245005200056260003600108300002800144490003900172500000500211700000500216  a038795225X  a511.6bM381.CA  aMartin, George E.  aCounting bThe art of enumerative combinatorics  aNew YorkbSpringer-Verlagc2001  axi, 250p. Bibl., Index.  aUndergraduate texts in Mathematics  a  a