T. Yuasa, Y. Wada, T. Enoto, Y. Furuta, H. Tsuchiya, S. Hisadomi, Y. Tsuji, K. Okuda, T. Matsumoto, K. Nakazawa, K. Makishima, S. Miyake, & Y. Ikkatai, "Thundercloud Project: Exploring high-energy phenomena in thundercloud and lightning" (訳: 雷雲プロジェクト - 雷雲と雷放電における高エネルギー現象の探索), Progress of Theoretical and Experimental Physics, Volume 2020, Issue 10, October 2020, 103H01