@article{BSMF_1915__43__69_1,
     author = {Cahen, E.},
     title = {Sur les substitutions fondamentales du groupe modulaire},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {69--88},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {43},
     year = {1915},
     doi = {10.24033/bsmf.953},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.953/}
}