@book{MSMF_1968__14__3_0,
     author = {Robert, Pierre},
     title = {Sur l'axiomatique des syst\`emes g\'en\'erateurs, des rangs, {Applications} \`a certains probl\`emes combinatoires},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {14},
     year = {1968},
     doi = {10.24033/msmf.14},
     mrnumber = {38 #101},
     zbl = {0237.08008},
     language = {fr},
     url = {http://www.numdam.org/item/MSMF_1968__14__3_0/}
}