+@Article{paige95,
+ author = "Chris C. Paige and Beresford N. Parlett and Henk A.
+ {van der Vorst}",
+ title = "Approximate solutions and eigenvalue bounds from
+ Krylov subspaces",
+ journal = "Numerical Linear Algebra with Applications",
+ volume = "2",
+ number = "2",
+ publisher = "John Wiley & Sons, Ltd",
+ ISSN = "1099-1506",
+ URL = "http://dx.doi.org/10.1002/nla.1680020205",
+ doi = "10.1002/nla.1680020205",
+ pages = "115--133",
+ keywords = "Krylov subspace, Lanczos process, symmetric matrix,
+ conjugate gradients, minimum residual, Lehmann
+ intervals",
+ year = "1995",
+}
+