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煤炭企业研发投入、投资效率和全要素生产率关系研究
王雨婷, 方瑞瑞, 李丽红, 冯连勇
Research on the relationship between R & D investment, investment efficiency and total factor productivity of coal enterprises
WANG Yuting, FANG Ruirui, LI Lihong, FENG Lianyong
煤炭经济研究 . 2025, (8): 14 -20 .