B. V. Bazalii and N. V. Vasil'eva, “On the Solvability of the Hele–Shaw Model Problem in Weighted Hölder Spaces in a Plane Angle”, Ukr. Mat. Zhurn., vol. 52, no. 11, pp. 1446–1457, Nov. 2000, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4552