%0 Journal Article
%A Pakula, Lewis
%A Schwartzman, Sol
%T Independence for Sets of Topological Spheres
%J Canadian mathematical bulletin
%D 1991
%P 520-524
%V 34
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-082-1/
%R 10.4153/CMB-1991-082-1
%F 10_4153_CMB_1991_082_1