James Baglama Daniela Calvetti Lothar Reichel Algorithm 827: irbleigs: A MATLAB program for computing a few eigenpairs of a large sparse Hermitian matrix. 337-348 2003 29 ACM Trans. Math. Softw. 3 http://doi.acm.org/10.1145/838250.838257 db/journals/toms/toms29.html#BaglamaCR03