Nonsymmetric multigrid preconditioning for conjugate gradient methods - Henricus Bouwmeester; Andrew Dougherty; Andrew V. Knyazev (CoRR, 2012)

Nonsymmetric Preconditioning for Conjugate Gradient and Steepest Descent Methods1. - Henricus Bouwmeester; Andrew Dougherty; Andrew V. Knyazev (ICCS, 2015)