El Karamany, A.S., and F.E. Kodsy. “The Torsion of a Nonhomogeneous Visco-Elastic Bar of Elliptic Cross-Section”. Engineering Transactions 36, no. 4 (December 31, 1988): 599–609. Accessed August 14, 2025. https://et.ippt.pan.pl/index.php/et/article/view/1736.