Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1969__19_1_a4, author = {Rovder, Jozef}, title = {Niektor\'e vlastnosti diferenci\'alnej rovnice $y''+f(x)|y| = 0$}, journal = {Mathematica slovaca}, pages = {53--62}, publisher = {mathdoc}, volume = {19}, number = {1}, year = {1969}, mrnumber = {0303010}, zbl = {0169.11304}, language = {sl}, url = {http://geodesic.mathdoc.fr/item/MASLO_1969__19_1_a4/} }
Rovder, Jozef. Niektoré vlastnosti diferenciálnej rovnice $y''+f(x)|y| = 0$. Mathematica slovaca, Tome 19 (1969) no. 1, pp. 53-62. http://geodesic.mathdoc.fr/item/MASLO_1969__19_1_a4/