@article{10_37236_776,
     author = {Ricky X. F. Chen},
     title = {A refinement of the formula for \(k\)-ary trees and the {Gould-Vandermonde's} convolution},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/776},
     zbl = {1159.05004},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/776/}
}