Kintzel, O., and J. Mosler. “A Coupled Isotropic Elasto-Plastic Damage Model Based on Incremental Minimization Principles”. Technische Mechanik - European Journal of Engineering Mechanics, vol. 30, no. 1-3, July 2019, pp. 177-84, https://journals.ub.ovgu.de/index.php/techmech/article/view/789.