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Freund, Robert M. Journal of Combinatorial Theory, Series B Vol. 47, No. 2 (1989): 192-219.
Freund, Robert M., Working Paper. June 1988.
Freund, Robert M., Working Paper. June 1988.
Freund, Robert M. Operations Research Letters Vol. 7, No. 1 (1988): 9–13.
Freund, Robert M. Mathematical Programming Vol. 38, No. 1 (1987): 47–68.