Cost-saving and decarbonization-oriented coordinated optimization for copper metallurgy integrated energy system under material–energy–carbon coupling constraints - Zhao Luo; Zitong Huang; Dewen Liu; Tao Zhang; Xudong Li; Qisiyun Cai; Huan Yan; Junkai Liang; Jiahao Li; Chao Li; Xinzhi Ding; Yuqin Wang; et al. (Journal of Cleaner Production, 2026)