E. Anderson, Z. Bai, C. Bischof, J. Demmel, J. Dongarra, J. Du Croz,
A. Greenbaum, S. Hammarling, A. McKenney, S. Ostrouchov, and D. Sorensen.
LAPACK Users' Guide.
SIAM, Philadelphia, 1992.
J. Stoer and R. Bulirsch.
Introduction to Numerical Analysis, volume 12 of Texts in
Applied Mathematics.
Springer-Verlag, New York, second edition, 1991.