Evtukhov VM, Vasileva NS. Conditions of oscillatory or nonoscillatory nature of solutions for a class of second-order semilinear differential equations. Ukr. Mat. Zhurn. [Internet]. 2007Apr.25 [cited 2024Apr.20];59(4):458–466. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3320