1. Arrow K. J. and Solow, R. M., "Gradient Methods for Constrained Maxima with Weakened Assumptions", in Studies in Linear and Nonlinear Programming, Arrow, K., Hurwicz, L., and Uzawa, H. (eds.), Stanford University Press, Stanford, 1958.
2. Asaadi J., "A Computational Comparison of some Non-linear Programs", Math. Prog., Vol. 4, 1973, pp. 144–154.
3. Bertsekas D. P., "On Penalty and Multiplier Methods for Constrained Minimization", SIAM J. on Control, to appear.
4. Fiacco A.V. and McCormick G. P., "Nonlinear Programming: Sequential Unconstrained Minimization Techniques", J. Wiley, New York, 1968.
5. Fletcher R., "A class of methods for nonlinear programming with termination and convergence properties", in Integer and Nonlinear Programming, J. Abadie (editor), North-Holland, 1970.