Lukovsky , I. A., and A. N. Timokha. “On a Class of Boundary Value Problems in the Theory of Surface Waves”. Ukrains’kyi Matematychnyi Zhurnal 43, no. 3 (February 28, 1991): 359–364. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9616.