Implementing normal extra deduction of R&D expenses under compliant conditions: Examples from oil & gasfield enterprises
DU Jianping, WANG Fuping, CHENG Jing, LI Jia, SHI Shuyou, GAO Ningxin
Natural Gas Technology and Economy . 2023, (3): 81 -88 .  DOI: 10.3969/j.issn.2095-1132.2023.03.013

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