S. C. Bae and D. Kim, “The Effect of R&D Investment on Market Value of Firms: Evidence from the U.S., Germany and Japan,” Multinational Business Review, Vol. 11, No. 3, 2003, pp. 51-75. doi:10.1108/1525383X200300016
 J. Lee, K. Whang and E. H. Hall Jr., “A Comparative Approach to the Strategic Impact of R&D and Export Activity on Firm Economic Performance in Small Business Firms: U.S., Japan and Korea,” ICSB World Conference Proceedings, Washington DC, 21-24 June 2009, pp. 1-16.
 Z. Zhu and J. Chen, “Synergizing Innovation Assets within an Organization under Open Environment,” 2005 International Engineering Management Conference Proceedings, St. John’s, 11-13 September 2005, pp. 372-375. doi:10.1109/IEMC.2005.1559155
 T. Li, X. Huang and C. Wang, “An Empirical Research on Enterprise R&D Expend and Operating Performance—An Comparison between Information and Manufactur E Industry Listed Companies,” Science of Science and Management of S&T, No. 7, 2008, pp. 170-174 (In Chinese).
 H. Ren and P. Shi, “Literature Review on the Relationship between R&D Investment and Firm Performance—From Direct Effects to Moderating Effects,” Science of Science and Management of S&T, No. 2, 2010, pp. 143-151 (In Chinese).
 X. Cheng, J. Sun and L. Yao, “The Value Relevance of Capitalized R&D Expenditures: Empirical Evidences from China’s Listed Companies,” China Soft Science Magzine, No. 6, 2010, pp. 141-150 (In Chinese).
 A. Drejer and J. O. Riis, “Competence Development and Technology, How Learning and Technology Can Be Meaningfully Integrated,” Technovation, Vol. 19, No. 10, 1999, pp. 631-644. doi:10.1016/S0166-4972(99)00064-4
 B. A. Lundvall, “The Learning Economy: Challenges to Economicy Theory and Policy,” In: K. Nielsen and B. Johnson, Eds., Institutions and Economic Change: New Perspectives on Marks, Firms and Technology, Edward Elgar, Cheltenham, 1998.
 R. M. Grant, “Prospering in Dynamically-Competitive Environments: Organizational Capability as Knowledge Integration,” Organization Science, Vol. 7, No. 4, 1996, pp. 375-387. doi:10.1287/orsc.7.4.375