1. Bredon, G.E., Homotopical properties of fixed point sets of circle group actions, Amer. J. M., 91 (1969), pp. 874–888.
2. ____, Introduction to Compact Transformation Groups, Academic Press, New York (to appear).
3. Hsiang, W.-Y., On generalizations of a theorem of A. Borel and their applications in the study of topological actions, Topology of Manifolds, pp. 274–290, Markham Publ. Co., Chicago, 1970.