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Number of items: **2**.

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