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@article{IM_1989__95_3_143657, author = {Kent E. Orr}, title = {Homotopy invariants of links.}, journal = {Inventiones mathematicae}, pages = {379--394}, publisher = {mathdoc}, volume = {95}, number = {3}, year = {1989}, zbl = {0668.57014}, url = {http://geodesic.mathdoc.fr/item/IM_1989__95_3_143657/} }
Kent E. Orr. Homotopy invariants of links.. Inventiones mathematicae, Tome 95 (1989) no. 3, pp. 379-394. http://geodesic.mathdoc.fr/item/IM_1989__95_3_143657/