%0 Journal Article
%A Brown, R.
%A Moore, E.J.
%A Porter, T.
%A Wensley, C.D.
%T Crossed complexes, and free crossed resolutions for amalgamated sums and HNN-extensions of groups.
%J Georgian Mathematical Journal
%D 2002
%P 623-644
%V 9
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/GMJ_2002__9_4_50551/
%G en
%F GMJ_2002__9_4_50551