1. Comtet, L., Advanced combinatorics. The art of finite and infinite expansions. Revised and enlarged edition, Reidel, Dordrecht, 1974.
2. Flajolet, P., and R. Sedgewick, Analitic combinatorics: functional equations, rational and algebraic functions, INRIA, Number 4103, 2001.
3. Flajolet, P., Odlyzko, A.M.: ‘Singularity analysis of generating functions’. SIAM J. on Discrete Math 3(2), 216–240 (1990)
4. Gardy, D., Random Boolean expressions, Colloquium on Computational Logic and Applications‘, Chambery (France), June 2005. Proceedings in DMTCS, 2006, pp. 1–26.
5. Joly, T.: ‘On the λ definability I, the Model Problem and Generalizations of the Matching Problem’. Fundamentae Informaticae 65(1-2), 135–151 (2005)