MathSciNet bibliographic data MR1164113 (93h:57039) 57Q45 (57M15 57M25) Kamada, Seiichi Surfaces in ${\bf R}\sp 4$${\bf R}\sp 4$ of braid index three are ribbon. J. Knot Theory Ramifications 1 (1992), no. 2, 137–160. Article

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