Electronic Resource
Schmidt, W. P.
;
Brucker, P.
;
Kreuzberger, H.
;
[et al.]
Ohse, D.
;
Kern, W.
;
Niemann, J.
;
Müller-Merbach, H.
;
Todt, H. J.
;
Gallus, G.
;
Mertens, P.
;
Menges, G.
Springer
Mathematical methods of operations research
15 (1971), S. 149-155