Preconditioning eigensolvers – an Oxymoron? Knyazev, Andrew V. — 1998 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Efficient solution of symmetric eigenvalue problems using multigrid preconditioners in the locally optimal block conjugate gradient method. Knyazev, Andrew V.; Neymeyr, Klaus — 2003 ETNA. Electronic Transactions on Numerical Analysis [electronic only]