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Hirsch, W. M.; Hoffmann, A. J. Extreme varieties, concave functions, and the fixed charge problem. (English) Zbl 0111.06001 Commun. Pure Appl. Math. 14, 355-369 (1961). PDFBibTeX XMLCite \textit{W. M. Hirsch} and \textit{A. J. Hoffmann}, Commun. Pure Appl. Math. 14, 355--369 (1961; Zbl 0111.06001) Full Text: DOI