Kourkoulis, S.K., and G.E. Exadaktylos. “The Displacement Discontinuity Technique in Fracture Mechanics: The Subsurface Crack Problem”. Archives of Mechanics 53, no. 4-5 (September 1, 2001): 421–437. Accessed December 13, 2025. https://am.ippt.pan.pl/index.php/am/article/view/v53p421.