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Brearley, A. L., Mitra, G. and Williams, H. Paul (1975) Analysis of mathematical programming problems prior to applying the simplex algorithm. Mathematical Programming, 8 (1). pp. 54-83. ISSN 0025-5610
Williams, H. Paul (1975) The formulation of mathematical programming models. Omega, 3 (5). pp. 551-556. ISSN 0305-0483