[B5] T.F. Banchoff, Tight polyhedral Klein bottles,
projective planes and Möbius bands,
Math. Ann.207 (1974) 233-243.

The author proves that there is not tight substantial Klein bottle in
E^n for n bigger than 5, and gives geometric
consequences of substantial embeddings in the highest possible
dimension. He shows that a tight projective plane is essentially
unique, as is a tight Möbius band.