MulyavaO.M., SheremetaM.M., and TrukhanYu.S. “Properties of Solutions of a Heterogeneous Differential Equation of the Second Order”. Carpathian Mathematical Publications 11, no. 2 (December 31, 2019): 379-398. Accessed June 8, 2023. https://journals.pnu.edu.ua/index.php/cmp/article/view/2116.