Multiple surfaces of non-constant mean curvature. Norbert Jakobowsky — 1994 Mathematische Zeitschrift
On interior and boundary regularity of weak solutions to a certain quasilinear elliptic system. Norbert Jakobowsky — 1992 Mathematische Zeitschrift
A perturbation result concerning a second solution to the Dirichlet problem for the equation of prescribed mean curvature. Norbert Jakobowsky — 1994 Journal für die reine und angewandte Mathematik