@article{GDZPPN002435772, title = {The ?-orbifold Group of a Link.}, journal = {Mathematische Zeitschrift}, volume = {199}, year = {1988}, pages = {187-208}, zbl = {0663.57006}, url = {http://dml.mathdoc.fr/item/GDZPPN002435772} }
Zimmermann, Bruno; Boileau, Michel. The ?-orbifold Group of a Link.. Mathematische Zeitschrift, Tome 199 (1988) pp. 187-208. http://gdmltest.u-ga.fr/item/GDZPPN002435772/