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[文献書誌] S.Fujishige,S.Iwata: "Minimizing & submodular function arising from a concave function"Discrete Applied Mathematics. 92. 211-215 (1999)
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[文献書誌] M.Shigeno,S.Iwata,S.T.McCormick: "Relaxed most negative cycle and most positive at cauceling algorithms for minimum cost flow"Mathematics of Operations Research. 25. (2000)
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