DEA-Based Green Positioning Strategy by Unified Efficiency Measure for the US Coal-fired Electricity Products. The IAFOR International Conference on Sustainability, Energy & the Environment - Hawaii 2017 Official Conference Proceedings. 2017. 1-19
Wakayama D. Problems in Evaluating Attitudes of Residents on the Merger of Municipalities for Local Governments. Proceedings of International Conference on Kansei Engineering and Emotion Research 2009 (KEER2009), 11F-03. 2009. 1-10
Fuzzy Purchase Intention Model :An Extension of Fishbein & Ajzen Model (Wakayama D. and Takemura K.). The Proceedings of Joint 2nd International Conference on Soft Computing and Intelligent Systems and 5th International Symposium on Advanced Intelligent Systems. 2004. WE8-4, 1-6