@article{JRAM_1987__379_152951,
     author = {H. Lewy and S. Hildebrandt and U. Dierkes},
     title = {On the analyticity of minimal surfaces at movable boundaries of prescribed length.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {100--114},
     publisher = {mathdoc},
     volume = {379},
     year = {1987},
     zbl = {0617.53010},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__379_152951/}
}