%0 Journal Article %A Gilbert Baumslag %A Peter B. Shalen %T Amalgamated products and finitely presented groups. %J Commentarii mathematici Helvetici %D 1990 %P 243-254 %V 65 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140193/ %F CMH_1990__65_3_140193