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BACKBONE OF TECHNOLOGY EVOLUTION IN THE MODERN ERA AUTOMOBILE INDUSTRY: AN ANALYSIS BY THE PATENTS CITATION NETWORK[J]. Yan LIN1 Jian CHEN2 Yan CHEN1 1Department of Management Science and Engineering, Dalian Maritime University, Dalian, 116026, China 2School of Economics and Management, Tsinghua University, Beijing, 10084, China.Journal of Systems Science and Systems Engineering. 2011(04)