@article{MAN_1972__196_162261,
     author = {Helmut Salzmann},
     title = {Homogene 4-dimensionale affine {Ebenen.}},
     journal = {Mathematische Annalen},
     pages = {320--322},
     publisher = {mathdoc},
     volume = {196},
     year = {1972},
     zbl = {0221.50008},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__196_162261/}
}