Huang, C. C.; Erickson, L. G.; Wellek, R. M. - In: Management Science 16 (1970) 11, pp. 762-763
The sufficiency conditions for constrained optimization problems are derived through an alternate approach and result in a simpler form than one latest work [Schechter, R. S., G. S. G. Beveridge. 1966. Sufficiency conditions in constrained variations. Indus. Eng. Chemistry Fundamentals 5...