%0 Journal Article %A O. Bottema %A J.T. Groenman %T On the upward motion of a double cone on an inclined plane. %J Elemente der Mathematik %D 1981 %P 121-126 %V 36 %I mathdoc %U http://geodesic.mathdoc.fr/item/ELMA_1981__36_141268/ %F ELMA_1981__36_141268