@article{BSMF_1892__20__22_1,
     author = {Raffy, L.},
     title = {D\'etermination de l'\'el\'ement lin\'eaire des surfaces spirales \`a lignes d'\'egale courbure parall\`eles},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {22--32},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {20},
     year = {1892},
     doi = {10.24033/bsmf.443},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.443/}
}