产学研合作与企业独立研发关系的进一步检验——基于企业R&D投入门槛效应的分析
산학연합작여기업독립연발관계적진일보검험——기우기업R&D투입문함효응적분석
Research on the university industry cooperation and enterprise internal innovation:empirical analysis based on the threshold effect of enterprise R&D investment
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