@article{MZ_1983__184_173378,
     author = {Stefan Hildebrandt and J.C.C. Nitsche},
     title = {Geometric {Properties} of {Minimal} {Surfaces} with {Free} {Boundaries.}},
     journal = {Mathematische Zeitschrift},
     pages = {497--510},
     publisher = {mathdoc},
     volume = {184},
     year = {1983},
     zbl = {0505.49020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1983__184_173378/}
}