Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1975__11_4_a1, author = {R\'ab, Milo\v{s}}, title = {Asymptotic behaviour of the equation $x''+p(t)x'+q(t)x=0$ with complex-valued coefficients}, journal = {Archivum mathematicum}, pages = {193--204}, publisher = {mathdoc}, volume = {11}, number = {4}, year = {1975}, mrnumber = {0404776}, zbl = {0356.34044}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1975__11_4_a1/} }
Ráb, Miloš. Asymptotic behaviour of the equation $x''+p(t)x'+q(t)x=0$ with complex-valued coefficients. Archivum mathematicum, Tome 11 (1975) no. 4, pp. 193-204. http://geodesic.mathdoc.fr/item/ARM_1975__11_4_a1/