%0 Journal Article
%A Zvonimir Janko
%A Tran van Trung
%T On Projective Planes of Order Twelve and Twenty.
%J Mathematische Zeitschrift
%D 1980
%P 199-202
%V 173
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1980__173_172980/
%F MZ_1980__173_172980