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2. Lecture Notes in Economics and Mathematical Systems;D. Hausmann,1978
3. D. Hausmann and B. Korte, “The relative strength of oracles for independence systems”, in: J. Frehse, D. Pallaschke and U. Trottenberg, eds., Special topics of applied mathematics, functional analysis, numerical analysis, and optimization (North-Holland, Amsterdam, 1980) pp. 195–211.
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5. E.L. Lawler, “Combinatorial optimization: networks and matroids” (Holt, Rinehart and Winston, New York, 1976).