@article{JIS_2007__10_4_a5,
     author = {Leroux, Philippe},
     title = {A simple symmetry generating operads related to rooted planar $m$-ary trees and polygonal numbers},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_4_a5/}
}