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@article{MAN_1971__193_182725, author = {Paul E. SCHUPP}, title = {Small {Cancellation} {Theory} over {Free} {Products} with {Amalgamation.}}, journal = {Mathematische Annalen}, pages = {255--264}, publisher = {mathdoc}, volume = {193}, year = {1971}, zbl = {0209.05204}, url = {http://geodesic.mathdoc.fr/item/MAN_1971__193_182725/} }
Paul E. SCHUPP. Small Cancellation Theory over Free Products with Amalgamation.. Mathematische Annalen, Tome 193 (1971), pp. 255-264. http://geodesic.mathdoc.fr/item/MAN_1971__193_182725/