Li, Mengxiao, Deng, Yu, Zhang, Hexin, Wong, Simon H. F., Mohamed, Ahmed, Zheng, Yu, Gao, Jiaxiang, Yuen, Terry Y. P., Dong, Biqin, Kuang, J. S., "Topology optimization of multi-material structures with elastoplastic strain hardening model", Structural and Multidisciplinary Optimization, 2021