1. Daniel, J. W., "The conjugate gradient method for linear and nonlinear operator equations," SIAM Journal on Nunmerical Analysis, Vol. 4, 10-26, 1967.
doi:10.1137/0704002 Google Scholar
2. Harrington, R. F., Field Computation by Moment Methods, New York, The Macmillan Company, 1968.
3. Hestenes, M. R. and E. Stiefel, "Methods of conjugate gradients for solving linear systems," Journal of Research of the National Bureau of Standards, Vol. 40, 409-435, 1952.
doi:10.6028/jres.049.044 Google Scholar
4. Kreyszig, E., Introductory Functional Analysis with Applications, New York, John Wiley & Sons, 1978.
5. Mur, G. and A. J. A. Nicia, "Calculation of reflection and transmission coefficients in one-dimensional wave propagation problems," Applied Physics, Vol. 47, 5218-5221, 1976.
doi:10.1063/1.322594 Google Scholar
6. Tijhuis, A. G., Electromagnetic Inverse Profiling: Theory and Numerical Implementation, 66, VNU Science Press BV, Utrecht, The Netherlands, 1987.
7. van den Berg, P. M., "Iterative computational techniques in scattering based upon the integrated square error criterion," IEEE Transactions on Antennas and Propagation, Vol. AP-32, 1063-1071, 1984.
doi:10.1109/TAP.1984.1143213 Google Scholar
8. van den Berg, P. M. and W. J. Ghijsen, "A spectral iterative technique with Gram-Schmidt orthogonalization," IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-36, 769-772, 1988.
doi:10.1109/22.3586 Google Scholar
9. van den Berg, P. M. and R. E. Kleinman, "The conjugate gradient spectral iterative technique for planar structures," IEEE Transactions on Antennas and Propagation, Vol. AP-36, 1418-1423, 1988.
doi:10.1109/8.8629 Google Scholar