@article{JEP_2016__3__365_0,
     author = {H\'enard, Olivier and Maillard, Pascal},
     title = {On trees invariant under edge contraction},
     journal = {Journal de l{\textquoteright}\'Ecole polytechnique {\textemdash} Math\'ematiques},
     pages = {365--400},
     publisher = {ole polytechnique},
     volume = {3},
     year = {2016},
     doi = {10.5802/jep.36},
     mrnumber = {3580038},
     zbl = {1364.60105},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jep.36/}
}