Unknown
Sekizawa, O
;
Uruga, T
;
Takagi, Y
;
[et al.]
Nitta, K
;
Kato, K
;
Tanida, H
;
Uesugi, K
;
Hoshino, M
;
Ikenaga, E
;
Takeshita, K
;
Takahashi, S
;
Sano, M
;
Aoyagi, H
;
Watanabe, A
;
Nariyama, N
;
Ohashi, H
;
... and further 22
Institute of Physics