@article{MZ_1971__119_171474,
     author = {Oddvar Iden},
     title = {The {Collineation} {Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {60--62},
     publisher = {mathdoc},
     volume = {119},
     year = {1971},
     zbl = {0193.21302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__119_171474/}
}