Principles and techniques in combinatorics / Chen Chuan-Chong and Koh Khee-Meng. Chen, Chuan Chong. Koh, K. M. (Khee Meng), 1944- Combinatorial analysis Problems, exercises, etc. 512.925 CHP Includes bibliographical references and index. Singapore ; World Scientific, aRiver edge, NJ : c1992. aRiver edge, NJ : c1992. 1992 Text xii, 298 p. : eng