Ravindra Boojhawon Muddun Bhuruth Restarted Simpler GMRES Augmented with Harmonic Ritz Vectors. 393-402 2002 conf/iccS/2002-2 International Conference on Computational Science (2) http://link.springer.de/link/service/series/0558/bibs/2330/23300393.htm db/conf/iccS/iccS2002-2.html#BoojhawonB02