Suo, Xiao-Zheng, and Alain Combescure. “Energy Release Rate and J Integral for Cracks Propagating in Nonhomogeneous Media Part I - Problem Formulation”. European Journal of Computational Mechanics 2, no. 1 (January 29, 1993): 75–93. Accessed June 17, 2024. https://journals.riverpublishers.com/index.php/EJCM/article/view/3683.