V. Govorukha, D. Munz, and M. Kamlah, “On the singular integral equations approach to the interface crack problem for piezoelectric materials”, Arch. Mech., vol. 52, no. 2, pp. 247–273, Mar. 2000, Accessed: Nov. 19, 2025. [Online]. Available: https://am.ippt.pan.pl/index.php/am/article/view/v52p247