1. Zur Isotopie Zweidimensionalen Fläschen im R4;Artin;Abh. Math. Sem. Hamburg Univ.,1962
2. J.F.P. Hudson and E.C. Zeeman: On regular neighbourhoods, to be published.
3. Combinatorial embeddings;Irwin;Bull. Amer. Math. Soc.,1962
4. Unpublished doctoral dissertation;Irwin,1962
5. Simplical spaces nuclei, and m-groups;Whitehead;Proc. Lond. Math. Soc.,1939