T. Mansour, M. Shattuck and C. Song, Enumerating set partitions according to the number of descents of size d or more, Proceedings of the Indian Academy of Sciences - Mathematical Sciences, 122, No.2 (2012), 507-517.
C. Song, Counting special families of labelled trees, Annals of Combinatorics, 10 (2006), 271-283.
C. Song, The generalized Schroeder theory, The Electronic Journal of Combinatorics, 12 (2005), R53.
C. Song and C.H. Yan, Descents of permutations in a Ferrers board, The Electronic Journal of Combinatorics, 19 (2012), R7.