1. Homotopy type of differentiable manifolds;Browder,1962
2. Engulfing;Hirsch;Bull. Am. math. Soc.,1966
3. Applications of engulfing;Levitt,1967
4. N. Levitt: Embedding pairs up to homotopy type, to appear.
5. Spaces satisfying Poincaré duality;Spivak;Topology,1967