@article{etna_vol26_pp453-473, author = {Petr Tich\'{y} and J\"org Liesen and Vance Faber}, title = {On worst-case GMRES, ideal GMRES, and the polynomial numerical hull of a Jordan block}, journal = {Electron. Trans. Numer. Anal.}, volume = {26}, year = {2007}, pages = {453--473}, }