@article{MZ_1980__174_173000,
     author = {Gerhard Str\"ohmer},
     title = {Instabile {Fl\"achen} vorgeschriebener mittlerer {Kr\"ummung.}},
     journal = {Mathematische Zeitschrift},
     pages = {119--134},
     publisher = {mathdoc},
     volume = {174},
     year = {1980},
     zbl = {0423.49029},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__174_173000/}
}