@article{GDZPPN002092425, title = {On Dihedral Covering Spaces of Knots.}, journal = {Inventiones mathematicae}, volume = {34}, year = {1976}, pages = {77-82}, zbl = {0315.55006}, url = {http://dml.mathdoc.fr/item/GDZPPN002092425} }
Perko, K.A. Jr. On Dihedral Covering Spaces of Knots.. Inventiones mathematicae, Tome 34 (1976) pp. 77-82. http://gdmltest.u-ga.fr/item/GDZPPN002092425/