@article{10_4064_ap_6_2_201_210,
     author = {Z. Opial},
     title = {Sur les valeurs asymptotiques des int\'egrales des \'equations diff\'erentielles lin\'eaires du second ordre},
     journal = {Annales Polonici Mathematici},
     pages = {201--210},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1959},
     doi = {10.4064/ap-6-2-201-210},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-6-2-201-210/}
}