by Shirotani, Ichimin, Takahashi, Eiji, Mukai, Naoki, Nozawa, Kiyokazu, Kinoshita, Minoru, Yagi, Takehiko, Suzuki, Kazuya, Enoki, Toshiaki, Hino, Syojun
Published in Japanese Journal of Applied Physics (01.01.1993)