@article{10_37236_151,
     author = {William Y.C. Chen and Oliver X.Q. Gao and Peter L. Guo},
     title = {Hook length formulas for trees by {Han's} expansion},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/151},
     zbl = {1180.05007},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/151/}
}