1. R. Fletcher. Practical Methods of Optimization, 2nd ed. Wiley, Chichester, 1987.
2. P. E. Gill, W. Murray, and M. H. Wright. Practical Optimization. Academic, London, 1981.
3. J. E. Dennis, Jr. and R. B. Schnabel. Numerical Methods for Unconstrained Optimization and Nonlinear Equations. Prentice-Hall, Englewood Cliffs, 1983.
4. Z. Havlas and R. Zahradník. Int. J. Quantum Chem., 26:607, 1984.
5. H.B. Schlegel. Adv. Chem.Phys., 69:249, 1987.