Harmonic map Heat Flow for axially symmetric Data. Joseph F. Grotowski — 1991 Manuscripta mathematica
A mixed boundary value problem for energy minimizing harmonic maps. Frank Duzaar; Joseph F. Grotowski — 1996 Mathematische Zeitschrift
Energy minimizing harmonic maps with an obstacle at the free boundary. Frank Duzaar; Joseph F. Grotowski — 1994 Manuscripta mathematica