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@article{MZ_1971__121_171547, author = {I.M.S. Dey and J. Cossey and S. Meskin}, title = {Subgroups of {Knot} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {99--103}, publisher = {mathdoc}, volume = {121}, year = {1971}, zbl = {0222.55006}, url = {http://geodesic.mathdoc.fr/item/MZ_1971__121_171547/} }
I.M.S. Dey; J. Cossey; S. Meskin. Subgroups of Knot Groups.. Mathematische Zeitschrift, Tome 121 (1971), pp. 99-103. http://geodesic.mathdoc.fr/item/MZ_1971__121_171547/