%0 Journal Article
%A Brown, B.
%T An Approximation to {X, Y}
%J Canadian mathematical bulletin
%D 1969
%P 133-137
%V 12
%N 2
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-012-7/
%R 10.4153/CMB-1969-012-7
%F 10_4153_CMB_1969_012_7