@article{GDZPPN002106086, title = {Homotopy invariants of links.}, journal = {Inventiones mathematicae}, volume = {96}, year = {1989}, pages = {379-394}, zbl = {0668.57014}, url = {http://dml.mathdoc.fr/item/GDZPPN002106086} }
Orr, Kent E. Homotopy invariants of links.. Inventiones mathematicae, Tome 96 (1989) pp. 379-394. http://gdmltest.u-ga.fr/item/GDZPPN002106086/