@article{JRAM_1963__212_150564,
     author = {M. Pinl},
     title = {Kriterien f\"ur euklidische {Differentialformen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--6},
     year = {1963},
     volume = {212},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1963__212_150564/}
}