Not knot (video), directed by Charlie Gunn and Delle Maxwell. 16 minutes. £23.95. 1995. ISBN 3-86025-754-4. (Geometry Center/Spektrum Videothek). - Supplement to Not knot, by David Epstein and Charlie Gunn. Pp. 48. Free with video. 1991. ISBN 0-86720-297-1. (Geometry Center/Jones and Bartlett, Boston MA) von Abbott, Steve

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