%0 Journal Article
%A Heiner Zieschang
%T Generators of Free Product with Amalgamation of two Infinite Cyclic Groups.
%J Mathematische Annalen
%D 1977
%P 195-222
%V 227
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1977__227_162976/
%F MAN_1977__227_162976