%0 Journal Article %A Ira M. Gessel %A Seunghyun Seo %T A refinement of Cayley's formula for trees %J The electronic journal of combinatorics %D 2004 %V 11 %N 2 %U http://geodesic.mathdoc.fr/articles/10.37236/1884/ %R 10.37236/1884 %F 10_37236_1884