Yasuhara, Akira y Mohamed Ait Nouh. «Torus knots that cannot be untied by twisting». Revista Matemática Complutense, vol. 14, vol. 14, n.º 2, 2001, pp. 423-37, doi: https://doi.org/10.5209/rev_REMA.2001.v14.n2.16993.