@article{IM_1969__8_141990,
     author = {J.C.C. NITSCHE},
     title = {The {Boundary} {Behavior} of {Minimal} {Surfaces.} {Kellogg's} {Theorem} and {Branch} {Points} on the {Boundary.}},
     journal = {Inventiones mathematicae},
     pages = {313--333},
     publisher = {mathdoc},
     volume = {8},
     year = {1969},
     zbl = {0195.23101},
     url = {http://geodesic.mathdoc.fr/item/IM_1969__8_141990/}
}