Limarchenko, O. S. “Specific Features of Application of Perturbation Techniques in Problems of Nonlinear Oscillations of a Liquid With Free Surface in Cavities of Noncylindrical Shape”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 1 (January 25, 2007): 44–70. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3291.