Lipschutz, Seymour . Theory and problems of discrete mathematics / Seymour Lipschutz and Marc Lars Lipson. - 2nd ed / . - New Delhi : Tata McGraw-Hill Publishing , 1999 (rep. 2000). - ix,528p. ; 23cm. NULL ISBN: 007463710X Rs. Subjects--Index Terms: MATHEMATICS-ALGEBRA Dewey Class. No.: 512.74 / LIP/T