Electronic Resource
Gallus, G.
;
Affeldt, D.
;
Zimmermann, H. J.
;
[et al.]
Hammann, P.
;
Heiland, H. W.
;
Todt, H.
;
Schmidt, Wolfgang P.
;
Müller-Merbach, H.
;
Boehm, F.
;
Schaltegger, P.
;
Waschek, G.
;
Henn, R.
Springer
Mathematical methods of operations research
16 (1972), S. B80