@article{10_4064_ap_8_1_71_74,
     author = {Z. Opial},
     title = {Sur les solutions de l'\'equation diff\'erentielle x'' + h(x)x' + f(x) = e(t)},
     journal = {Annales Polonici Mathematici},
     pages = {71--74},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1960},
     doi = {10.4064/ap-8-1-71-74},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-71-74/}
}