When should a firm set its selling price to cope with gray market trade?”, Kobe University Graduate Student Working Paper Series, 2017“Effectiveness of excusive territories by competing manufacturers managing dual-channel supply chains”, Kobe University Discussion Paper Series, 2017(co-authored with Kenji Matsui)“Product life cycle and choice of transportation modes: Japan’s evidence of import and export”, Kobe University Discussion Paper Series, 2013(co-authored with Hideki Murakami,Yukari Matsuse,Koji Mukaigawa)