@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/