Unknown
Miyoshi, Y
;
Kasaba, Y
;
Shinohara, I
;
[et al.]
Takashima, T
;
Asamura, K
;
Matsumoto, H
;
Higashio, N
;
Mitani, T
;
Kasahara, S
;
Yokota, S
;
Wang, S
;
Kazama, Y
;
Kasahara, Y
;
Yagitani, S
;
Matsuoka, A
;
Kojima, H
;
... and further 6
Institute of Physics