@article{AIHPC_2006__23_6_891_0,
     author = {Harrivel, Dikanaina},
     title = {Planar binary trees and perturbative calculus of observables in classical field theory},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {891--909},
     publisher = {Elsevier},
     volume = {23},
     number = {6},
     year = {2006},
     doi = {10.1016/j.anihpc.2005.09.006},
     mrnumber = {2271700},
     zbl = {05138725},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2005.09.006/}
}