Sokołowski, M., and E. Turska-Kłębek. “On the Approximate Evaluation of Interaction of Cracks in Elastic Media”. Engineering Transactions 31, no. 1 (March 30, 1983): 115–150. Accessed April 24, 2025. https://et3.ippt.pan.pl/index.php/et/article/view/1930.