Regularity results for minimizing currents with a free boundary. Michael Grüter — 1987 Journal für die reine und angewandte Mathematik
Eine Bemerkung zur Regularität stationärer Punkte von konform invarianten Variationsintegralen. Michael Grüter — 1986 Manuscripta mathematica
Optimal regularity for codimension one minimal surfaces with a free boundary. Michael Grüter — 1987 Manuscripta mathematica
Conformally invariant variational integrals and the removability of isolated singularities. Michael Grüter — 1984 Manuscripta mathematica
Regularity at the free boundary of two-dimensional stationary harmonic maps Michael Grüter — 1998 Annales de l'I.H.P. Analyse non linéaire
Allard type regularity results for varifolds with free boundaries Michael Grüter; Jürgen Jost — 1986 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
The Green Function for Uniformly Elliptic Equations. Michael Grüter; Kjell-O. Widman — 1982 Manuscripta mathematica