@article{MM2_1973__8_154142,
     author = {Karlheinz Goldhorn},
     title = {Fl\"achen beschr\"ankter mittlerer {Kr\"ummung} in einer dreidimensionalen {Riemannschen} {Mannigfaltigkeit.}},
     journal = {Manuscripta mathematica},
     pages = {189--208},
     publisher = {mathdoc},
     volume = {8},
     year = {1973},
     zbl = {0258.53051},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__8_154142/}
}