%0 Journal Article
%A Schirmer, Helga
%T Coincidence Producing Maps Onto Trees
%J Canadian mathematical bulletin
%D 1967
%P 417-423
%V 10
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-039-x/
%R 10.4153/CMB-1967-039-x
%F 10_4153_CMB_1967_039_x