1. On the genus of the alternating knot. I, II;Murasugi, Kunio;J. Math. Soc. Japan,1958
2. On the imbedding of polyhedra in 3-space;Fox, Ralph H.;Ann. of Math. (2),1948
3. \bysame, Free differential calculus. I, Ann. of Math. (2) 57 (1953), 547-560; II, ibid. 59 (1954), 196-210; III, ibid. 64 (1956), 407-419.
4. A quick trip through knot theory;Fox, R. H.,1962
5. Some problems in knot theory;Fox, R. H.,1962