@article{GDZPPN002306239, title = {Homogene 4-dimensionale affine Ebenen.}, journal = {Mathematische Annalen}, volume = {196}, year = {1972}, pages = {320-322}, zbl = {0221.50008}, url = {http://dml.mathdoc.fr/item/GDZPPN002306239} }
Salzmann, Helmut. Homogene 4-dimensionale affine Ebenen.. Mathematische Annalen, Tome 196 (1972) pp. 320-322. http://gdmltest.u-ga.fr/item/GDZPPN002306239/