@article{ELMA_1964__19_140793,
     author = {E. Stiefel},
     title = {Die {Renaissance} der {Himmelsmechanik.}},
     journal = {Elemente der Mathematik},
     pages = {97--106},
     publisher = {mathdoc},
     volume = {19},
     year = {1964},
     zbl = {0128.41305},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1964__19_140793/}
}