@article{JAC_2002__15_3_a2,
     author = {Loday, Jean-Louis and Ronco, Mar{\'\i}a O.},
     title = {Order structure on the algebra of permutations and of planar binary trees},
     journal = {Journal of Algebraic Combinatorics},
     pages = {253--270},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2002__15_3_a2/}
}