WATANABE Hirotaka. Japan's Participation in the U.S. Space Shuttle Program: Achievements and Lessons in Space Policy. Osaka University Law Review. 2016. 63. 33-52
WATANABE Hirotaka. Japanese Space Policy during the 1970s: A Road to Autonomy by Modifying the Japan-U.S. Space Cooperation Agreements. History of Rocketry and Astronautics, American Astronautical Society (AAS) History Series. 2014. 42. 153-180
WATANABE Hirotaka. The Space Policy of the Nixon and Ford Administrations: Another Detente Diplomacy through Project Apollo and ASTP. HISTORY OF ROCKETRY AND ASTRONAUTICS. 2014. 41. 217-232
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 2023)
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 2022)