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@article{IM_1996__123_3_144337, author = {G\'abor Tardos}, title = {Towards the {Hanna} {Neumann} conjecture using {Dicks's} method.}, journal = {Inventiones mathematicae}, pages = {95--104}, publisher = {mathdoc}, volume = {123}, number = {3}, year = {1996}, zbl = {0848.20019}, url = {http://geodesic.mathdoc.fr/item/IM_1996__123_3_144337/} }
Gábor Tardos. Towards the Hanna Neumann conjecture using Dicks's method.. Inventiones mathematicae, Tome 123 (1996) no. 3, pp. 95-104. http://geodesic.mathdoc.fr/item/IM_1996__123_3_144337/