@book{MSMF_1968__15__3_0,
     author = {Fouques, A.},
     title = {Syst\`emes de $a$-id\'eaux dans un demi-groupe non commutatif},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {15},
     year = {1968},
     doi = {10.24033/msmf.15},
     mrnumber = {38 #4582},
     zbl = {0179.03903},
     language = {fr},
     url = {http://www.numdam.org/item/MSMF_1968__15__3_0/}
}