O. M. Barnyak, “A projective method for the construction of solutions of the problem of normal symmetric oscillations of viscous liquid”, Ukr. Mat. Zhurn., vol. 49, no. 2, pp. 315–320, Feb. 1997, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5009