Townsend, Michael Discrete mathematics : applied combinatorics and graph theory / Michael Townsend. - Menlo Park, Calif. : Benjamin/Cummings Pub. Co., c1987. - xv, 387 p. : ill. ; Subjects--Topical Terms: Mathematics.Computer science--Mathematics.Combinatorial analysis. Universal Decimal Class. No.: 519.1:519.17 / TOW