@article{GDZPPN002109573, title = {On the intersection of subgroups of a free group.}, journal = {Inventiones mathematicae}, volume = {110}, year = {1992}, pages = {29-36}, zbl = {0798.20015}, url = {http://dml.mathdoc.fr/item/GDZPPN002109573} }
Tardos, Gábor. On the intersection of subgroups of a free group.. Inventiones mathematicae, Tome 110 (1992) pp. 29-36. http://gdmltest.u-ga.fr/item/GDZPPN002109573/