@article{MZ_1967__96_170664,
     author = {Richard E. Block},
     title = {On the {Orbits} of {Collineation} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {33--49},
     publisher = {mathdoc},
     volume = {96},
     year = {1967},
     zbl = {0163.42304},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__96_170664/}
}