@article{etna_vol43_pp100-124, author = {Thomas Mach and Miroslav S. Prani\'c and Raf Vandebril}, title = {Computing approximate (block) rational Krylov subspaces without explicit inversion with extensions to symmetric matrices}, journal = {Electron. Trans. Numer. Anal.}, volume = {43}, year = {2014-2015}, pages = {100--124}, }