1. Duff IS, Reid JK. MA47, a Fortran code for direct solution of indefinite sparse symmetric linear systems. RAL Report #95-001, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, January 1995.
2. A preconditioning technique for indefinite linear systems;Komzsik;Finite Elements in Analysis and Design,1997
3. Towards robust two-level methods for indefinite systems;Fish;Computing Systems in Engineering, An International Journal,1993
4. Sparse algorithms for indefinite system of linear equations;Chen,1997
5. Efficient sparse equation solver with unrolling strategies for computational mechanics;Qin,1997