@article{IM_1973__21_142223,
     author = {T.C. Hurley},
     title = {On a {Problem} of {Fox.}},
     journal = {Inventiones mathematicae},
     pages = {139--142},
     publisher = {mathdoc},
     volume = {21},
     year = {1973},
     zbl = {0272.20017},
     url = {http://geodesic.mathdoc.fr/item/IM_1973__21_142223/}
}