%0 Journal Article
%A Hannebauer, Torsten
%T Relation modules of amalgamated free products and HNN extensions
%J Glasgow mathematical journal
%D 1989
%P 263-270
%V 31
%N 3
%U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007849/
%R 10.1017/S0017089500007849
%F 10_1017_S0017089500007849