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@article{MZ_1986__193_173809, author = {Ravi S. Kulkarni}, title = {Geometry of {Free} {Products.}}, journal = {Mathematische Zeitschrift}, pages = {613--624}, publisher = {mathdoc}, volume = {193}, year = {1986}, zbl = {0584.20016}, url = {http://geodesic.mathdoc.fr/item/MZ_1986__193_173809/} }
Ravi S. Kulkarni. Geometry of Free Products.. Mathematische Zeitschrift, Tome 193 (1986), pp. 613-624. http://geodesic.mathdoc.fr/item/MZ_1986__193_173809/