@article{ELMA_1970__25_140958,
     author = {G.R. Veldkamp},
     title = {Die {Jakobische} {Achsenkonstruktion} einer {Ellipse.}},
     journal = {Elemente der Mathematik},
     pages = {15--15},
     publisher = {mathdoc},
     volume = {25},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1970__25_140958/}
}