The Complete cd-Index of Boolean Lattices. - Neil J. Y. Fan; Liao He (Electron. J. Comb., 2015)

On the non-negativity of the complete cd-index. - Neil J. Y. Fan; Liao He (Discret. Math., 2015)

The sorting index and inversion number on order ideals of permutation groups. - Neil J. Y. Fan; Liao He; Teresa X. S. Li; Alina F. Y. Zhao (Discret. Math., 2016)