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Inoue, T. and Nagayama, S. (2012). "Strategic Types and Performance of Niche-Firms within Business Ecosystems: A Study of the Japanese Video Game Industry," Waseda Business & Economics Studies, Vol.47, pp. 1-18.

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Inoue, T. and Nagayama, S."The Effect of Niches' behaviors on the Japanese Video Game Business Ecosystem: Focusing on the Niche Creation, Productivity and Robustness as the Ecosystem Performance," Academy of International Business Annual Conference, Nanzan University, 26, Jun., 2011.

Inoue, T. and Nagayama, S. "Niche Strategies in Business Ecosystems: Challengers, Defenders, Replicators, and Opportunity Seekers," Asia Academy of Management 7th Conference, Macau University, 13, Dec. 2010. $B$[$+(B
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