A. Cooper Marek Szularz Jim Weston Analysis of the Lanczos Error Bounds and Its Application to the Explicitly Restarted Lanczos Algorithm. 410-417 2001 conf/ppam/2001 PPAM http://link.springer.de/link/service/series/0558/bibs/2328/23280410.htm db/conf/ppam/ppam2001.html#CooperSW01