Matsushita, K. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Kawaharada, M., Takahashi, I., Nakazawa, K., Matsushita, K., Fukazawa, Y., Shimasaku, K., et al. (2003). The dark group candidate RXJ 0419+0225. In T. Ohashi, & N. Yamasaki (Eds.), Workshop on Galaxies and Cluster of Galaxies (pp. 87-90). Tokyo: Japan society for promotion of science.