Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1970__6_3_a5, author = {Neuman, Franti\v{s}ek}, title = {A note on differential equations with periodic solutions}, journal = {Archivum mathematicum}, pages = {189--192}, publisher = {mathdoc}, volume = {06}, number = {3}, year = {1970}, mrnumber = {0320411}, zbl = {0241.34028}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1970__6_3_a5/} }
Neuman, František. A note on differential equations with periodic solutions. Archivum mathematicum, Tome 06 (1970) no. 3, pp. 189-192. http://geodesic.mathdoc.fr/item/ARM_1970__6_3_a5/