Hook Length Formulas for Trees by Han's Expansion. - William Y. C. Chen; Oliver X. Q. Gao; Peter L. Guo (Electron. J. Comb., 2009)

On Han's Hook Length Formulas for Trees. - William Y. C. Chen; Oliver X. Q. Gao; Peter L. Guo (Electron. J. Comb., 2011)

q-Hook length formulas for signed labeled forests. - William Y. C. Chen; Oliver X. Q. Gao; Peter L. Guo (Adv. Appl. Math., 2013)