融资约束与企业R&D投资效率研究--基于中国中小板上市公司的经验证据

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1004-5937|volume|7|45-50

ISSN: 1004-5937

Source: 会计之友, Vol.volume, Iss.7, 2015-01, pp. : 45-50

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Abstract