1. Manifolds with few periodic homeomorphisms;Conner, P. E.,1972
2. S. Mac Lane, Homology, Die Grundlehren der math. Wissenschaften, Band 114, Academic Press, New York; Springer-Verlag, Berlin, 1963. MR 28 #122.
3. The end point compactification of manifolds;Raymond, Frank;Pacific J. Math.,1960
4. D. Sullivan, unpublished.