@article{MAN_1984__269_163923,
     author = {Ernst Heintze and Jochen Br\"uning},
     title = {Spektrale {Starrheit} gewisser {Drehfl\"achen.}},
     journal = {Mathematische Annalen},
     pages = {95--102},
     publisher = {mathdoc},
     volume = {269},
     year = {1984},
     zbl = {0553.53028},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__269_163923/}
}