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LIPSCHUTZ S., . (2004). 2000 SOLVED PROBLEMS IN DISCRETE MATHEMATICS. NEW DELHI: TMH.
LIPSCHUTZ SEYMOUR, . 2004. 2000 SOLVED PROBLEMS IN DISCRETE MATHEMATICS. NEW DELHI: TMH.
LIPSCHUTZ SEYMOUR, . 2000 SOLVED PROBLEMS IN DISCRETE MATHEMATICS. NEW DELHI: TMH. 2004.