1. Regular 0(n)-manifolds, suspension of knots, and knot periodicity;Bredon;Bull. Am. math. Soc.,1973
2. Beispiele zur differential Topologie von Singularitäten;Brieskorn;Invent. Math.,1966
3. Foliations of odd-dimensional spheres;Durfee;Ann. Math.,1972
4. A quick trip through knot theory;Fox,1962
5. M. Kato: A classification of simple spinnable structures on S2n+1 (preprint).