@article{BSMF_1926__54__190_0,
     author = {Valiron, G.},
     title = {Sur les surfaces qui admettent un plan tangent en chaque point},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {190--198},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {54},
     year = {1926},
     doi = {10.24033/bsmf.1102},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1102/}
}