Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1970__20_2_a9, author = {Rovder, Jozef}, title = {Niektor\'e vlastnosti diferenci\'alnej rovnice $y''+f(x)|y| = 0$}, journal = {Mathematica slovaca}, pages = {141--149}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1970}, mrnumber = {0303011}, zbl = {0198.12302}, language = {sl}, url = {http://geodesic.mathdoc.fr/item/MASLO_1970__20_2_a9/} }
Rovder, Jozef. Niektoré vlastnosti diferenciálnej rovnice $y''+f(x)|y| = 0$. Mathematica slovaca, Tome 20 (1970) no. 2, pp. 141-149. http://geodesic.mathdoc.fr/item/MASLO_1970__20_2_a9/