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@article{IM_1987__89_143484, author = {S. Yamada}, title = {The minimal number of {Seifert} circles equals the braid index of a link.}, journal = {Inventiones mathematicae}, pages = {347--356}, publisher = {mathdoc}, volume = {89}, year = {1987}, zbl = {0634.57004}, url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143484/} }
S. Yamada. The minimal number of Seifert circles equals the braid index of a link.. Inventiones mathematicae, Tome 89 (1987), pp. 347-356. http://geodesic.mathdoc.fr/item/IM_1987__89_143484/