I. O. Lukovsky and A. N. Timokha, “One version of the Linearized theory of nonstationary boundary-value problems with free boundary”, Ukr. Mat. Zhurn., vol. 48, no. 6, pp. 791–804, Jun. 1996, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5279