1. E. A.Bender (1974) Asymptotic methods in enumeration, SIAM Rev. 16, 485?515.
2. D. Duffus, V. Rödl, B. Sands, and R. Woodrow, Enumeration of Order Preserving Maps (preprint).
3. I. P.Goulden and D. M.Jackson (1983) Combinatorial Enumeration, Wiley, New York.
4. I. Rival and A. Rutkowski, Does Almost Every Isotone Self-Map Have a Fixed Point? (preprint).
5. B. Sands, Personal communication.