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

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