@article{JAC_2015__42_1_a8,
     author = {Pei, Jun and Guo, Li},
     title = {Averaging algebras, {Schr\"oder} numbers, rooted trees and operads},
     journal = {Journal of Algebraic Combinatorics},
     pages = {73--109},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2015__42_1_a8/}
}