1. IMSL Library User's Manual, IMSL Inc., NBC Building, Houston, Texas.
2. NAG FORTRAN Library Manual, Numerical Algorithms Group Limited, Oxford.
3. Harwell Subroutine Library, Published by HMSO, London.
4. LINPACK Users Guide;Dongarra;SIAM, Philadelphia,1979
5. J.J. Moré, B.S. Garbow, K.E. Hillstrom, "User Guide for MINPACK-l", Argonne National Laboratory, Report ANL-80-74.