%0 Journal Article
%A Christoph Hering
%A Michael Walker
%T Perspectivities in Irreducible Collineation Groups of Projective Planes. I.
%J Mathematische Zeitschrift
%D 1977
%P 95-102
%V 155
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1977__155_172547/
%F MZ_1977__155_172547