@article{10_4064_ap_9_2_157_181,
     author = {Z. Opial},
     title = {Sur les solutions presque-p\'eriodiques d'une classe d'\'equations diff\'erentielles},
     journal = {Annales Polonici Mathematici},
     pages = {157--181},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1960},
     doi = {10.4064/ap-9-2-157-181},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-9-2-157-181/}
}