1. Circuits and trees in oriented graphs;Aardenne-Ehrenfest;Simon Stevin,1951
2. Restricted choices;Abramson;Canad. Math. Bull.,1965
3. A note on permutations with fixed pattern;Abramson;J. Combinatorial Theory Ser. A,1975
4. Permutations without rising or falling w-sequences;Abramson;Ann. Math. Statist.,1967
5. Développements de sec x et de tang x;André;C. R. Acad. Sci. Paris,1879