%0 Journal Article
%A Ronald Brown
%T Groupoids and crossed objects in algebraic topology
%J Homology, homotopy, and applications
%D 1999
%P 1-78
%V 1
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4310/HHA.1999.v1.n1.a1/
%R 10.4310/HHA.1999.v1.n1.a1
%G en
%F HHA_1999_1_1_a1