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@article{MZ_1962__78_170038, author = {Hanfried Lenz}, title = {Halbdrehungen im {Raum.}}, journal = {Mathematische Zeitschrift}, pages = {410--419}, publisher = {mathdoc}, volume = {78}, year = {1962}, zbl = {0101.37401}, url = {http://geodesic.mathdoc.fr/item/MZ_1962__78_170038/} }
Hanfried Lenz. Halbdrehungen im Raum.. Mathematische Zeitschrift, Tome 78 (1962), pp. 410-419. http://geodesic.mathdoc.fr/item/MZ_1962__78_170038/