Electronic Resource
Nagai, Y.
;
Takeda, K.
;
Motoyama, S.
;
[et al.]
Ohsaki, T.
;
Igashira, M.
;
Mukai, N.
;
Uesawa, F.
;
Ando, T.
;
Kitazawa, H.
;
Fukuda, T.
Amsterdam
:
Elsevier
Nuclear Inst. and Methods in Physics Research, B
56-57 (1991), S. 492-495