@article{CMH_1931__3_138552,
     author = {P. Lambossy},
     title = {Sur une mani\`ere de diff\'erencier les fonctions cycliques d'une forme donn\'ee.},
     journal = {Commentarii mathematici Helvetici},
     pages = {69--102},
     publisher = {mathdoc},
     volume = {3},
     year = {1931},
     zbl = {57.1339.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1931__3_138552/}
}