@article{CRMATH_2007__345_6_341_0,
     author = {Crimaldi, Irene and Letta, Giorgio and Pratelli, Luca},
     title = {Sur l'interversion de l'ordre entre deux op\'erations sur les tribus},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {341--344},
     publisher = {Elsevier},
     volume = {345},
     number = {6},
     year = {2007},
     doi = {10.1016/j.crma.2007.07.020},
     language = {fr},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.07.020/}
}