Thinking on natural-gas supply and use enterprises to sign and execute medium- and long-term purchase and sales contracts
HE Zhiming, DU Qiping, YANG Yawen, YUAN Can, TAN Qi, SONG Xiaoqiong
Natural Gas Technology and Economy . 2026, (1): 51 -57 .  DOI: 10.3969/j.issn.2095-1132.2026.01.008

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