MathSciNet bibliographic data MR1664961 57M25 (57M15) Motohashi, Tomoe; Taniyama, Kouki Delta unknotting operation and vertex homotopy of graphs in \$\bold R\sp 3\$$\bold R\sp 3$. KNOTS '96 (Tokyo), 185–200, World Sci. Publ., River Edge, NJ, 1997. Links to the journal or article are not yet available

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