A Proof of then! Conjecture for Generalized Hooks. - Ethan Reiner (J. Comb. Theory A, 1996)

Variation on a theme of Solomon. - Ethan Reiner (Discret. Math., 1998)

Permutation Trees and Variation Statistics. - Gábor Hetyei; Ethan Reiner (Eur. J. Comb., 1998)