@article{10_4064_ap_8_1_75_89,
     author = {Z. Opial},
     title = {Sur la d\'ependance des solutions d'un syst\`eme d'\'equations diff\'erentielles de leurs seconds membres. {Application} aux syst\`emes presque autonomes},
     journal = {Annales Polonici Mathematici},
     pages = {75--89},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1960},
     doi = {10.4064/ap-8-1-75-89},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-75-89/}
}