@article{BUMI_1954_3_9_4_a3,
     author = {Massera, J. L.},
     title = {Sur un th\'eor\`eme de {G.} {Sansone} sur l'\'equation di {Li\'enard.}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {367--369},
     publisher = {mathdoc},
     volume = {Ser. 3, 9},
     number = {4},
     year = {1954},
     zbl = {0057.07004},
     mrnumber = {68691},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1954_3_9_4_a3/}
}