Keiichi Kodama, Yoshiki Nakano. The Effects of Verbal or Nonverbal Reflection on Collaborative Insight Problem Solving. International Journal of Psychology. 2016. 51. Supplement S1. 500-500
Yoshiki Nakano, Keiichi Kodama. The effect of collaboration on insightful problem solving in the puzzle of “Tangram”. 32nd British Psychology Society - Cognitive Psychology Section Annual Conference. 2015
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