%0 Journal Article
%A Ralph L. Cohen
%A John R. Klein
%T Umkehr maps
%J Homology, homotopy, and applications
%D 2009
%P 17-33
%V 11
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4310/HHA.2009.v11.n1.a2/
%R 10.4310/HHA.2009.v11.n1.a2
%G en
%F HHA_2009_11_1_a2