@article{BSMF_1889__17__84_0,
     author = {Issaly},
     title = {\'Etude g\'eom\'etrique sur la courbure des pseudosurfaces},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {84--101},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {17},
     year = {1889},
     doi = {10.24033/bsmf.382},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.382/}
}