@article{MZ_1968__103_170920,
     author = {Fred Piper},
     title = {The {Orbit} {Structure} of {Collineation} {Groups} of {Finite} {Projective} {Planes.}},
     journal = {Mathematische Zeitschrift},
     pages = {318--332},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     zbl = {0155.49202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170920/}
}