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@article{CMH_1994__69_4_140325, author = {Holger Meinert}, title = {The geometric invariants of direct products of virtually free groups.}, journal = {Commentarii mathematici Helvetici}, pages = {39--48}, publisher = {mathdoc}, volume = {69}, number = {4}, year = {1994}, zbl = {0834.20039}, url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140325/} }
Holger Meinert. The geometric invariants of direct products of virtually free groups.. Commentarii mathematici Helvetici, Tome 69 (1994) no. 4, pp. 39-48. http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140325/