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zhdefei 发表于 2011-5-27 22:27 On a pair of nonlinear mixed integer programming problems M.S. Mishra1, a, D. Acharya1, b and S. Nanda European Journal of Operational Research Volume 19, Issue 1, January 1985, Pages 98-103 http://www.sciencedirect.com/science/article/pii/0377221785903133