On the Smoothing Property of Multigrid Methods in the Non-symmetric Case. - Alois Ecker; Walter Zulehner (Numer. Linear Algebra Appl., 1996)

A Class of Smoothers for Saddle Point Problems. - Walter Zulehner (Computing, 2000)

Analysis of iterative methods for saddle point problems: a unified approach. - Walter Zulehner (Math. Comput., 2002)

On Schwarz-type Smoothers for Saddle Point Problems. - Joachim Schöberl; Walter Zulehner (Numerische Mathematik, 2003)

A robust PDE solver for the 3D Stokes/Navier-Stokes systems on the grid environment. - Huidong Yang; Walter Zulehner; Ulrich Langer; Markus Baumgartner (GRID, 2007)

GStokes: A Grid-enabled Solver for the 3D Stokes/Navier-Stokes System on Hybrid Meshes. - Ulrich Langer; Walter Zulehner; Huidong Yang; Markus Baumgartner (ISPDC, 2007)

Symmetric Indefinite Preconditioners for Saddle Point Problems with Applications to PDE-Constrained Optimization Problems. - Joachim Schöberl; Walter Zulehner (SIAM J. Matrix Anal. Appl., 2007)

Inexact Data-Sparse Boundary Element Tearing and Interconnecting Methods. - Ulrich Langer; Günther Of; Olaf Steinbach; Walter Zulehner (SIAM J. Sci. Comput., 2007)

On Schwarz-type smoothers for saddle point problems with applications to PDE-constrained optimization problems. - René Simon; Walter Zulehner (Numerische Mathematik, 2009)

Convergence analysis of multigrid methods with collective point smoothers for optimal control problems. - Stefan Takacs; Walter Zulehner (Comput. Vis. Sci., 2011)

Numerical simulation of fluid-structure interaction problems on hybrid meshes with algebraic multigrid methods. - Huidong Yang; Walter Zulehner (J. Comput. Appl. Math., 2011)

Nonstandard Norms and Robust Estimates for Saddle Point Problems. - Walter Zulehner (SIAM J. Matrix Anal. Appl., 2011)

A Robust Multigrid Method for Elliptic Optimal Control Problems. - Joachim Schöberl; René Simon; Walter Zulehner (SIAM J. Numer. Anal., 2011)

Efficient Preconditioning for an Optimal Control Problem with the Time-Periodic Stokes Equations. - Wolfgang Krendl; Valeria Simoncini; Walter Zulehner (ENUMATH, 2013)

A robust finite element solver for a multiharmonic parabolic optimal control problem. - Markus Kollmann; Michael Kolmbauer; Ulrich Langer; Monika Wolfmayr; Walter Zulehner (Comput. Math. Appl., 2013)

Stability estimates and structural spectral properties of saddle point problems. - Wolfgang Krendl; Valeria Simoncini; Walter Zulehner (Numerische Mathematik, 2013)

Convergence Analysis of All-at-Once Multigrid Methods for Elliptic Control Problems under Partial Elliptic Regularity. - Stefan Takacs; Walter Zulehner (SIAM J. Numer. Anal., 2013)

Mass Smoothers in Geometric Multigrid for Isogeometric Analysis. - Clemens Hofreither; Walter Zulehner (Curves and Surfaces, 2014)

Spectral Analysis of Geometric Multigrid Methods for Isogeometric Analysis. - Clemens Hofreither; Walter Zulehner (NMA, 2014)

The Ciarlet-Raviart Method for Biharmonic Problems on General Polygonal Domains: Mapping Properties and Preconditioning. - Walter Zulehner (SIAM J. Numer. Anal., 2015)

On the Analysis of Block Smoothers for Saddle Point Problems. - Daniel Drzisga; Lorenz John; Ulrich Rüde; Barbara I. Wohlmuth; Walter Zulehner (SIAM J. Matrix Anal. Appl., 2018)

A Decomposition Result for Kirchhoff Plate Bending Problems and a New Discretization Approach. - Katharina Rafetseder; Walter Zulehner (SIAM J. Numer. Anal., 2018)

The Elasticity Complex. - Dirk Pauly; Walter Zulehner (CoRR, 2020)

Robust Preconditioners for Multiple Saddle Point Problems and Applications to Optimal Control Problems. - Alexander Beigl; Jarle Sogn; Walter Zulehner (SIAM J. Matrix Anal. Appl., 2020)

A short note on inf-sup conditions for the Taylor-Hood family Qk-Qk-1. - Walter Zulehner (CoRR, 2022)

Matrix-Free Monolithic Multigrid Methods for Stokes and Generalized Stokes Problems. - Daniel Jodlbauer; Ulrich Langer; Thomas Wick; Walter Zulehner (SIAM J. Sci. Comput., 2024)

Heat Conduction with Phase Change in Permafrost Modules of Vegetation Models. - David Hötten; Jenny Niebsch; Ronny Ramlau; Walter Zulehner (CoRR, 2025)