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@article{ELMA_1969__24_140910, author = {O. Bottema}, title = {A {Theorem} of {Bobillier} on the {Tetrahedron.}}, journal = {Elemente der Mathematik}, pages = {6--10}, publisher = {mathdoc}, volume = {24}, year = {1969}, zbl = {0165.23902}, url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140910/} }
O. Bottema. A Theorem of Bobillier on the Tetrahedron.. Elemente der Mathematik, Tome 24 (1969), pp. 6-10. http://geodesic.mathdoc.fr/item/ELMA_1969__24_140910/