1. Aho, A. V., Hopcroft, J. E., Ullman, J. D.:The Design and Analysis of Algorithms. Addison-Wesley, Reading, Mass., 1974.
2. Bender, E. A.:Asymptotic methods in enumeration. SIAM Review 16 (1974), 485–515.
3. Bromwich, T. J. I'A:An Introduction to the Theory of Infinite Series. Macmillan, London, 1926 (Second Edition).
4. Darboux, G.: Mémoire sur l'approximation des fonctions des trés grand nombres, J. de Mathématiques (3) 6 (1878), 1–56, 377–416.
5. Doberkat, E.-E.:Some observations on the average behavior of heapsort—preliminary report. 21st IEEE FOCS, Syracuse, N.Y., (1980), 229–237.