Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1957_114_3_a8, author = {L. D. Nikolenko}, title = {Some criteria for non-oscillation of a fourth order differential equation}, journal = {Doklady Akademii Nauk}, pages = {483--485}, publisher = {mathdoc}, volume = {114}, number = {3}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a8/} }
L. D. Nikolenko. Some criteria for non-oscillation of a fourth order differential equation. Doklady Akademii Nauk, Tome 114 (1957) no. 3, pp. 483-485. http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a8/