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@article{MS2_1979__45_166677, author = {Charles H. Giffen}, title = {Link concordance implies link homotopy.}, journal = {Mathematica Scandinavica}, pages = {243--254}, publisher = {mathdoc}, volume = {45}, year = {1979}, zbl = {0453.57002}, url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166677/} }
Charles H. Giffen. Link concordance implies link homotopy.. Mathematica Scandinavica, Tome 45 (1979), pp. 243-254. http://geodesic.mathdoc.fr/item/MS2_1979__45_166677/