@article{CMH_1966__41_139329,
     author = {Tilla Klotz and Robert Ossermann},
     title = {Complete {Surfaces} in {E3} with {Constant} {Mean} {Curvature.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {313--318},
     publisher = {mathdoc},
     volume = {41},
     year = {1966},
     url = {http://geodesic.mathdoc.fr/item/CMH_1966__41_139329/}
}