Ismail, A. E., A. K. Ariffin, S. Abdullah, and M. J. Ghazali. “Finite Element Analysis of J-Integral for Surface Cracks in Round Bars under Combined Mode I Loading”. International Journal of Integrated Engineering, vol. 9, no. 2, Apr. 2017, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/1547.