選好投票
↑ Wilf, Herbert S. (January 1994) [1990]. “Chapter 5: Analytic and asymptotic methods”. generatingfunctionology (Second Edition ed.). Academic Press. pp. 175–176. ISBN 0-12-751956-4. http://www.math.upenn.edu/~wilf/DownldGF.html 2006年8月6日閲覧。