@article{ELMA_1969__24_140946,
     author = {H. Bieri},
     title = {Extremale konvexe {Rotationshalbk\"orper} im {V,} {F,} {M-Problem} des {R3.}},
     journal = {Elemente der Mathematik},
     pages = {121--125},
     year = {1969},
     volume = {24},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140946/}
}