Electronic Resource
Becchetti, F.D.
;
Brown, J.A.
;
Ashktorab, K.
;
[et al.]
Janecke, J.W.
;
Liu, W.Z.
;
Roberts, D.A.
;
Smith, R.J.
;
Kolata, J.J.
;
Morsad, A.
;
Larrikin, K.
;
Warner, R.E.
Amsterdam
:
Elsevier
Nuclear Inst. and Methods in Physics Research, B
56-57 (1991), S. 554-558