Generalized Aggregation-Based Multilevel Preconditioning of Crouzeix-Raviart FEM Elliptic Problems. - Svetozar Margenov; Josef Synka (Numerical Methods and Applications, 2006)

The Effect of a Minimum Angle Condition on the Preconditioning of the Pivot Block Arising from 2-Level-Splittings of Crouzeix-Raviart FE-Spaces. - Josef Synka (LSSC, 2007)

On the multilevel preconditioning of Crouzeix-Raviart elliptic problems. - Johannes Kraus 001; Svetozar Margenov; Josef Synka (Numer. Linear Algebra Appl., 2008)