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@article{AM2_1968__1_135996, author = {J.F. Rigby}, title = {Collineations on {Quadrilaterals} in {Projective} {Planes.} {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {318--320}, publisher = {mathdoc}, volume = {1}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/AM2_1968__1_135996/} }
J.F. Rigby. Collineations on Quadrilaterals in Projective Planes. (Short Communication).. Aequationes mathematicae, Tome 1 (1968), pp. 318-320. http://geodesic.mathdoc.fr/item/AM2_1968__1_135996/