Berkowski, P., J.M. Sieczkowski, M. Doblaré, and L. Garcia. “An Interactive Program for Shape Optimization of Sections Under Saint-Venant Torsion Using Boundary Element Method”. Engineering Transactions 43, no. 1-2 (July 1, 1995): 45–70. Accessed January 17, 2026. http://et.ippt.gov.pl/index.php/et/article/view/1484.