E. V. . Bulavenko, “On Dirichlet’s problem for the elasticity theory operator ”, Ukr. Mat. Zhurn., vol. 40, no. 1, pp. 109–110, Dec. 1987, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/9065