@article{10_37236_1884,
     author = {Ira M. Gessel and Seunghyun Seo},
     title = {A refinement of {Cayley's} formula for trees},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {2},
     doi = {10.37236/1884},
     zbl = {1080.05005},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1884/}
}