Banaś, K., & 		Wheeler, M.
(2023).
 Preconditioning GMRES for discontinuous Galerkin approximations.
<em>Computer Assisted Methods In Engineering And Science, 11</em>(1), 47-62.
Retrieved from <a href="https://cames.ippt.gov.pl/index.php/cames/article/view/1043" target="_new">https://cames.ippt.gov.pl/index.php/cames/article/view/1043</a>