@article{10_4064_ap_8_1_65_69,
     author = {Z. Opial},
     title = {Sur une \'equation diff\'erentielle non lin\'eaire du second ordre},
     journal = {Annales Polonici Mathematici},
     pages = {65--69},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1960},
     doi = {10.4064/ap-8-1-65-69},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-65-69/}
}