Kusner, Robert B.; Sullivan, John M. (1998), "On distortion and thickness of knots", Topology and geometry in polymer science (Minneapolis, MN, 1996), IMA Vol. Math. Appl., vol. 103, New York: Springer, pp. 67–78, doi:10.1007/978-1-4612-1712-1_7, MR1655037. See in particular p. 77.
Kusner, Robert B.; Sullivan, John M. (1998), "On distortion and thickness of knots", Topology and geometry in polymer science (Minneapolis, MN, 1996), IMA Vol. Math. Appl., vol. 103, New York: Springer, pp. 67–78, doi:10.1007/978-1-4612-1712-1_7, MR1655037. See in particular p. 77.
Kusner, Robert B.; Sullivan, John M. (1998), "On distortion and thickness of knots", Topology and geometry in polymer science (Minneapolis, MN, 1996), IMA Vol. Math. Appl., vol. 103, New York: Springer, pp. 67–78, doi:10.1007/978-1-4612-1712-1_7, MR1655037. See in particular p. 77.