@article{MZ_1972__129_171823,
     author = {Robert Gulliver and Joel Spruck},
     title = {Surfaces of {Constant} {Mean} {Curvature} {Which} {Have} a {Simple} {Projection.}},
     journal = {Mathematische Zeitschrift},
     pages = {95--108},
     publisher = {mathdoc},
     volume = {129},
     year = {1972},
     zbl = {0233.53003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171823/}
}