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Joint Optimization of Planning and Operation in Multi-Region Integrated Energy Systems Considering Flexible Demand Response. - Shan Gao 004; Tiancheng E. Song; Sai Liu; Cheng Zhou; Chenkai Xu; Haomin Guo; Xiaogang Li; Zheng Li 007; Yu Liu 010; Weiyi Jiang; Juncheng Wang; Sicheng Wang (IEEE Access, 2021)