Andreas Frommer Valeria Simoncini Error Bounds for Lanczos Approximations of Rational Functions of Matrices. 203-216 2008 Numerical Validation in Current Hardware Architectures http://dx.doi.org/10.1007/978-3-642-01591-5_13 conf/dagstuhl/2008nv db/conf/dagstuhl/nv2008.html#FrommerS08