RUS IA. ”Homogeneous” second order differential equation: zeros separation principles. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2018 Jun. 30 [cited 2025 Feb. 5];63(2):245–256. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2069