Tanaka, H. K. M., Nakano, T., Takahashi, S., Yoshida, J., Takeo, M., Oikawa, J., Ohminato, T., Aoki, Y., Koyama, E., Tsuji, H., Ohshima, H., Maekawa, T., Watanabe, H., & Niwa, K. (2008). Radiographic imaging below a volcanic crater floor with cosmic-ray muons.
American Journal of Science,
308(7), 843–850.
https://doi.org/10.2475/07.2008.02