@article{AM2_1985__28_137052,
     author = {G\"unter Pickert},
     title = {Teilmengengraphen und projektive {R\"aume.}},
     journal = {Aequationes mathematicae},
     pages = {144--150},
     publisher = {mathdoc},
     volume = {28},
     year = {1985},
     zbl = {0566.51014},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137052/}
}