@article{JOLT_2007_17_2_a0,
     author = {Jean-Gabriel Luque and Jean-Christophe Novelli and Jean-Yves Thibon},
     title = {Period {Polynomials} and {Ihara} {Brackets}},
     journal = {Journal of Lie Theory},
     pages = {229--239},
     year = {2007},
     volume = {17},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2007_17_2_a0/}
}