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@article{IM_1992__108_2_143986, author = {G\'abor Tardos}, title = {On the intersection of subgroups of a free group.}, journal = {Inventiones mathematicae}, pages = {29--36}, publisher = {mathdoc}, volume = {108}, number = {2}, year = {1992}, zbl = {0798.20015}, url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_143986/} }
Gábor Tardos. On the intersection of subgroups of a free group.. Inventiones mathematicae, Tome 108 (1992) no. 2, pp. 29-36. http://geodesic.mathdoc.fr/item/IM_1992__108_2_143986/