Souichirou Kozuka, "National Space Law and Licensing of Commercial Space Activities in Japan," in Lesley Jane Smith, Ingo Baumann, Susan-Gale Wintermuth eds., Routledge Handbook of Commercial Space Law, pp.119-132, Routledge, 2023.
Souichirou Kozuka, Aika Umemiya, "The Control of Risks and the Space Law: the Use of Space Insurance under the US and Japanese Space Law Compared," 35th International Symposium on Space Technology and Science (ISTS), Tokushima, Japan, 15 July 2025.
Hirotaka Watanabe, "Project Apollo as a U.S. Space Policy: Review of Several Issues," 35th International Symposium on Space Technology and Science (ISTS), Tokushima, Japan, 15 July 2025.
Souichirou Kozuka, Aika Umemiya, "Formation of Japan's Space Law," 34th International Symposium on Space Technology and Science (ISTS), Kurume, Fukuoka, Japan, 6 June 2023.
Hirotaka Watanabe, "Japan's Space Policy and the End of the Cold War: To Strengthen the Japan-U.S. Alliance," 34th International Symposium on Space Technology and Science (ISTS), Kurume, Fukuoka, Japan, 6 June 2023.
Hirotaka Watanabe, "The Evolution of Japan's Space Policy and Organizations: Domestic, Diplomatic and Security Challenges," 33rd International Symposium on Space Technology and Science (ISTS), Beppu, Oita, Japan, all-online, 1 March 2022.