@article{MZ_1975__141_172172,
     author = {Friedrich Tomi},
     title = {A {Pertubation} {Theorem} for {Surfaces} of {Constant} {Mean} {Curvature.}},
     journal = {Mathematische Zeitschrift},
     pages = {253--264},
     publisher = {mathdoc},
     volume = {141},
     year = {1975},
     zbl = {0295.53003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__141_172172/}
}