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@article{MZ_1921__9_167616, author = {W., Blaschke}, title = {\"Uber affine {Geometrie} {XXIX:} {Die} {Starrheit} der {Eifl\"achen}}, journal = {Mathematische Zeitschrift}, pages = {142--146}, publisher = {mathdoc}, volume = {9}, year = {1921}, zbl = {48.0837.01}, url = {http://geodesic.mathdoc.fr/item/MZ_1921__9_167616/} }
W., Blaschke. Über affine Geometrie XXIX: Die Starrheit der Eiflächen. Mathematische Zeitschrift, Tome 9 (1921), pp. 142-146. http://geodesic.mathdoc.fr/item/MZ_1921__9_167616/