Unknown
Mancuso, A P
;
Gorniak, Th
;
Staier, F
;
[et al.]
Yefanov, O M
;
Barth, R
;
Christophis, C
;
Reime, B
;
Gulden, J
;
Singer, A
;
Pettit, M E
;
Nisius, Th
;
Wilhein, Th
;
Gutt, C
;
Grübel, G
;
Guerassimova, N
;
Treusch, R
;
... and further 6
Institute of Physics