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@article{MZ_1931__33_168269, author = {W., Haack}, title = {Affine {Differentialgeometrie} der parabolischen {Strahlensysteme}}, journal = {Mathematische Zeitschrift}, pages = {232--270}, publisher = {mathdoc}, volume = {33}, year = {1931}, zbl = {57.0958.03}, url = {http://geodesic.mathdoc.fr/item/MZ_1931__33_168269/} }
W., Haack. Affine Differentialgeometrie der parabolischen Strahlensysteme. Mathematische Zeitschrift, Tome 33 (1931), pp. 232-270. http://geodesic.mathdoc.fr/item/MZ_1931__33_168269/