by Asakawa, Kiyoshi, Sugimoto, Yoshimasa, Watanabe, Yoshinori, Ozaki, Nobuhiko, Mizutani, Akio, Takata, Yoshiaki, Kitagawa, Yoshinori, Ishikawa, Hiroshi, Ikeda, Naoki, Awazu, Koichi, Wang, Xiaomin, Watanabe, Akira, Nakamura, Shigeru, Ohkouchi, Shunsuke, Inoue, Kuon, Kristensen, Martin, Sigmund, Ole, Ingo Borel, Peter, Baets, Roel
Published in New journal of physics (22.09.2006)