@article{GDZPPN002090600, title = {On a Problem of Fox.}, journal = {Inventiones mathematicae}, volume = {20}, year = {1973}, pages = {139-142}, zbl = {0272.20017}, url = {http://dml.mathdoc.fr/item/GDZPPN002090600} }
Hurley, T.C. On a Problem of Fox.. Inventiones mathematicae, Tome 20 (1973) pp. 139-142. http://gdmltest.u-ga.fr/item/GDZPPN002090600/