@article{10_4064_ap_6_2_181_200,
     author = {Z. Opial},
     title = {Sur l'allure asymptotique des solutions de l'\'equation diff\'erentielle u'' + a(t)u' + b(t)u = 0},
     journal = {Annales Polonici Mathematici},
     pages = {181--200},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1959},
     doi = {10.4064/ap-6-2-181-200},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-6-2-181-200/}
}