Ramanujan grammar and Cayley trees. (Grammaire de Ramanujan et arbres de Cayley.)
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Dumont, Dominique, Ramamonjisoa, Armand (1996)
The Electronic Journal of Combinatorics [electronic only]
Bergeron, Nantel, Billey, Sara (1993)
Experimental Mathematics
Radcliffe, A.J., Scott, A.D. (1999)
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Lee Mohler, Lex Oversteegen (1986)
Fundamenta Mathematicae
Jaroslav Nešetřil (1977)
Commentationes Mathematicae Universitatis Carolinae
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