1. Flajolet, P., Sedgewick, R., 2008. Analytic Combinatorics, web edition, 809+xii pages (available from the authors’ web sites) Cambridge Univ. Press. (in press) http://algo.inria.fr/flajolet/Publications/books.html
2. Collision probability between sets of random variables;Wendl;Statistics & Probability Letters,2003