@article{03938044, title = {Minimizing the presentation of a knot group.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {8}, year = {1985}, pages = {571-578}, doi = {10.1155/S016117128500062X}, zbl = {0585.57002}, language = {en}, url = {http://dml.mathdoc.fr/item/03938044} }
Dugopolski, Mark J. Minimizing the presentation of a knot group.. International Journal of Mathematics and Mathematical Sciences, Tome 8 (1985) pp. 571-578. doi : 10.1155/S016117128500062X. http://gdmltest.u-ga.fr/item/03938044/