@article{BSMF_1880__8__80_1,
     author = {Haag},
     title = {Note sur une classe d'\'equations diff\'erentielles},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {80--81},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {8},
     year = {1880},
     doi = {10.24033/bsmf.192},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.192/}
}