Sheremeta, M.M., and Yu.S. Trukhan. “Properties of Analytic Solutions of Three Similar Differential Equations of the Second Order”. Carpathian Mathematical Publications 13, no. 2 (August 29, 2021): 413–425. Accessed June 18, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/4528.