BiCGstab( l ) for linear equations involving unsymmetric matrices with complex spectrum. Sleijpen, Gerard L.G.; Fokkema, Diederik R. — 1993 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Efficient expansion of subspaces in the Jacobi-Davidson method for standard and generalized eigenproblems. Sleijpen, Gerard L.G.; van der Horst, Henk A.; Meijerbrink, Ellen — 1998 ETNA. Electronic Transactions on Numerical Analysis [electronic only]