1. F.Bergeron, G.Labelle, and P.Leroux; Functional Equation for Data Structures, this volume.
2. R.P. Brent and H.T. Kung; Fast Algorithms for Manipulating Formal Power Series, JACM 25 (4), 1978, pp 581–595.
3. P. Flajolet; Elements of a General Theory of Combinatorial Structures, Proceedings FCT85, L. Budach, Ed., Lect. Notes in Comp. Science, Springer-Verlag, Vol. 199 (1985), pp. 112–127.
4. G.H. Gonnet; Handbook of Algorithms and Data Structures, International Computer Science Series, Addison-Wesley, 1984.
5. A. Joyal; Une théorie combinatoire des séries formelles, Adv. in Math. 42, 1981, pp 1–82.