Nanakorn, P., and P. Soparat. “Finite Element Analysis of Cracking Localization: The Smeared Crack Approach With a Mixed Formulation”. Science & Technology Asia, vol. 5, no. 3, Nov. 2015, pp. 28-39, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41891.