1. Oren, S. S., and Luenberger, D. G., Self-Scaling Variable Metric (SSVM) Algorithms, I: Criteria and Sufficient Conditions for Scaling a Class of Algorithms, Management Science, Vol. 20, pp. 845–862, 1974.
2. Fletcher, R., Practical Methods of Optimization, 2nd Edition, Wiley, Chichester, England, 1987.
3. Powell, M. J. D., Some Global Convergence Properties of a Variable Metric Algorithm for Minimization without Exact Line Searches, Nonlinear Programming, Edited by R. W. Cottle and C. E. Lemke, SIAM Publications, Philadelphia, Pennsylvania, Vol. 9, pp. 53–72, 1976.
4. Zhang, Y., and Tewarson, R. P., Quasi-Newton Algorithms with Updates from the Preconvex Part of Broyden's Family, IMA Journal of Numerical Analysis, Vol. 8, pp. 487–509, 1988.
5. Byrd, R., Nocedal, J., and Juan, Y., Global Convergence of a Class of Quasi-Newton Methods on Convex Problems, SIAM Journal on Numerical Analysis, Vol. 24, pp. 1171–1190, 1987.