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@article{MZ_1973__132_171919, author = {Martin Tretkoff}, title = {The {Residual} {Finiteness} of {Certain} {Amalgameted} {Free} {Products.}}, journal = {Mathematische Zeitschrift}, pages = {179--182}, publisher = {mathdoc}, volume = {132}, year = {1973}, zbl = {0251.20034}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__132_171919/} }
Martin Tretkoff. The Residual Finiteness of Certain Amalgameted Free Products.. Mathematische Zeitschrift, Tome 132 (1973), pp. 179-182. http://geodesic.mathdoc.fr/item/MZ_1973__132_171919/