Free boundary problems for Stoke's flows and finite element methods Nitsche, Joachim A. — 1986 Equadiff 6
Interior error estimates of projection methods Nitsche, Joachim A. — 1973 Proceedings of Equadiff III
L ∞ -convergence of finite element Galerkin approximations for parabolic problems Joachim A. Nitsche — 1979 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique