1. A quick trip through knot theory;Fox, R. H.,1962
2. Some problems in knot theory;Fox, R. H.,1962
3. L. R. Hitt, Handlebody presentations of knot cobordisms, Ph. D. Dissertation, Florida State University, 1977.
4. \bysame, Ribbon n-knots, preprint, University of South Alabama.
5. Les nœuds de dimensions supérieures;Kervaire, Michel A.;Bull. Soc. Math. France,1965