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中国农学通报
企业多元化经营与生产效率关系的实证研究
余国新
Empirical Research on Relationship Between Diversification and Production Efficiency
YU Guo-xin
中国农学通报 . 2009, (2): 300 -306 .  DOI: 10.11924/j.issn.1000-6850.2008-1204