@article{MAN_1980__249_163387,
     author = {Michel Lassalle},
     title = {Deux g\'en\'eralisation du {\guillemotleft}th\'eor\`em des trois cercles{\guillemotright} de {Hadamard.}},
     journal = {Mathematische Annalen},
     pages = {17--26},
     publisher = {mathdoc},
     volume = {249},
     year = {1980},
     zbl = {0458.31002},
     url = {http://geodesic.mathdoc.fr/item/MAN_1980__249_163387/}
}