Wallis, Water D., Introduction to combinatorics / Walter D. Wallis, John C. George. - Second edition. - xix, 423 pages : illustrations ; 25 cm. - Discrete mathematics and its applications . "A Chapman & Hall book." Includes bibliographical references and index. ISBN: 9781498777605 9781498777605 (Hb.) Subjects--Topical Terms: Combinatorial analysis--Textbooks. LC Class. No.: QA164 / .W35 2017