@article{MZ_1971__121_171548,
     author = {Helmut Salzmann},
     title = {Kollineationsgruppen kompakter 4-dimensionaler {Ebenen.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {104--110},
     publisher = {mathdoc},
     volume = {121},
     year = {1971},
     zbl = {0218.50009},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__121_171548/}
}