1. Aasen, J.O.: On the reduction of a symmetric matrix to tridiagonal form. BIT 11, 233–242 (1971)
2. Ammar, G., Gragg, W.B.: Superfast solution of real positive definite Toeplitz systems. SIAM J. Matrix. Anal. Appl. 9(1), 61–76 (1988)
3. Andersen, B.S., Waśniewski, J, Gustavson, F.G.: A recursive formulation of Cholesky factorization or a packed matrix. ACM Trans. Math. Softw. 27(2), 214–244 (2001)
4. Anderson, E., Bai, Z., Bischof, C.H., Blackford, L.S., Demmel, J.W., Dongarra, J.J., Du Croz, J.J., Greenbaum, A., Hammarling, S.J., McKenney, A., Sorensen, D.C.: LAPACK Users’ Guide, 3rd edn. SIAM, Philadelphia (1999)
5. Ashcraft, C., Grimes, R.G., Lewis, J.G.: Accurate symmetric indefinite linear system solvers. SIAM J. Matrix Anal. Appl. 38(1), 513–561 (1998)