@article{05875538, title = {Efficient separability in free groups.}, journal = {Sibirskij Matematicheskij Zhurnal}, volume = {50}, year = {2009}, pages = {765-771}, zbl = {1212.20055}, language = {en}, url = {http://dml.mathdoc.fr/item/05875538} }
Buskin, N.V. Efficient separability in free groups.. Sibirskij Matematicheskij Zhurnal, Tome 50 (2009) pp. 765-771. http://gdmltest.u-ga.fr/item/05875538/