This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.
5. J. P. Barthelemy , An asymptotic equivalent for the number of total preorders on a finite set, Discrete Mathematics 29 (1980) pp. 311–313.
6. R. W. Bailey , The number of weak orderings of a finite set, Social Choice and Welfare 15 (1998) pp. 559–562.
8. A. C. Aitken , A problem in combinations, Edinburgh Mathematical Notes 28 (1933) pp. xviii–xxiii.
9. L. Comtet , Advanced combinatorics: the art of finite and infinite expansions (revised edition), D. Reidel Publishing Company, Dordrecht, Holland (1974).