@article{MZ_1978__164_172765,
     author = {Graham H. Williams},
     title = {Surfaces of {Prescribed} {Mean} {Curvature} with {Inequalities} on the {Boundary.}},
     journal = {Mathematische Zeitschrift},
     pages = {31--52},
     publisher = {mathdoc},
     volume = {164},
     year = {1978},
     zbl = {0378.49029},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__164_172765/}
}