Unknown
Tanaka, K
;
Nakata, M
;
Ohtani, Y
;
[et al.]
Tokuzawa, T
;
Yamada, H
;
Warmer, F
;
Nunami, M
;
Satake, S
;
Tala, T
;
Tsujimura, T
;
Takemura, Y
;
Kinoshita, T
;
Takahashi, H
;
Yokoyama, M
;
Seki, R
;
Igami, H
;
... and further 18
Institute of Physics