@article{BSMF_1933__61__186_0,
     author = {Vincensini, Paul},
     title = {Sur certains mouvements de figures invariables. {H\'elico{\"\i}des} pseudo-sph\'eriques et couples de sph\`eres. {Transformation} par polaires r\'eciproques},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {186--208},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {61},
     year = {1933},
     doi = {10.24033/bsmf.1204},
     zbl = {0008.17604},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.1204/}
}