@article{JAC_2009__30_3_a5,
     author = {Foissy, L.},
     title = {The infinitesimal {Hopf} algebra and the poset of planar forests.},
     journal = {Journal of Algebraic Combinatorics},
     pages = {277--309},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2009__30_3_a5/}
}