Preconditioned Conjugate Gradient Methods : Proceedings of a Conference held in Nijmegen The Netherlands June 19–21 1989 Modified incomplete factorization strategies On some parallel preconditioned CG schemes Preconditioning indefinite systems arising from mixed finite element discretization of second order elliptic problems A class of preconditioned conjugate gradient methods applied to finite element equations Recent vectorization and parallelization of ITPACKV On the sparsity patterns of hierarchical finite element matrices Solving positive (semi)definite linear systems by preconditioned iterative methods The convergence behaviour of preconditioned CG and CG S in the presence of rounding errors Data reduction (dare) preconditioning for generalized conjugate gradient methods Analysis of a recursive 5 point 9 point factorization method Iteration method as discretization procedures.