1. CORE Discussion Paper;I. Barany,1983
2. CORE Discussion Paper;I. Barany,1983
3. L.R. Ford and D.R. Fulkerson, Flows in networks (Princeton University Press, Princeton, NJ, 1962).
4. Report BW 147/81;A. Kolen,1981
5. International Series of Numerical Mathematics (ISNM);J. Krarup,1977