1. Hestenes, M. R.,Multiplier and Gradient Methods, Journal of Optimization Theory and Applications, Vol. 4, pp. 303?320, 1969.
2. Powell, M. J. D.,A Method for Nonlinear Constraints in Minimization Problems, Optimization, Edited by R. Fletcher, Academic Press, London, England, 1969.
3. Fletcher, R.,An Ideal Penalty Function for Constrained Optimization, Journal of Institute of Mathematics and Applications, Vol. 15, pp. 319?340, 1975.
4. Biggs, M. C.,Constrained Minimization Using Recursive Quadratic Programming: Some Alternative Subproblem Formulations, Toward Global Optimization, Edited by L. C. W. Dixon and G. P. Szegö, North-Holland Publishing Company, Amsterdam, Holland, 1975.
5. Han, S. P.,A Globally Convergent Method for Nonlinear Programming, Journal of Optimization Theory and Applications, Vol. 22, pp. 297?309, 1977.