[1]
Y. P. Apakov and T. D. Dzhuraev, “On the theory of the third-order equation with multiple characteristics containing the second time derivative”, Ukr. Mat. Zhurn., vol. 62, no. 1, pp. 40–51, Jan. 2010, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2842