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@article{MAN_1978__237_182789, author = {Donald J. Collins}, title = {Presentations of the {Amalgamated} {Free} {Product} of two {Infinite} {Cycles.}}, journal = {Mathematische Annalen}, pages = {233--242}, publisher = {mathdoc}, volume = {237}, year = {1978}, zbl = {0385.20019}, url = {http://geodesic.mathdoc.fr/item/MAN_1978__237_182789/} }
Donald J. Collins. Presentations of the Amalgamated Free Product of two Infinite Cycles.. Mathematische Annalen, Tome 237 (1978), pp. 233-242. http://geodesic.mathdoc.fr/item/MAN_1978__237_182789/