O. S. Limarchenko, “Specific features of application of perturbation techniques in problems of nonlinear oscillations of a liquid with free surface in cavities of noncylindrical shape”, Ukr. Mat. Zhurn., vol. 59, no. 1, pp. 44–70, Jan. 2007, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3291