@article{ELMA_1967__22_140868,
     author = {J. Berkes},
     title = {Bestimmung einer oberen {Schranke} f\"ur den {Inhalt} des {Parallelrisses} eines regelm\"a{\ss}igen {K\"orpers.}},
     journal = {Elemente der Mathematik},
     pages = {133--136},
     publisher = {mathdoc},
     volume = {22},
     year = {1967},
     zbl = {0171.19302},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1967__22_140868/}
}