1. M. F. Atiyah and F. Hirzebruch, Spin-Manifolds and Group Actions, Essays on Topology and Related Topics, Springer-Verlag, 1970, pp. 18–28.
2. Annals of Mathematics Studies;A. Borel,1960
3. A. Borel, On the automorphisms of certain subgroups of semi-simple Lie groups, International Colloquium on Algebraic Geometry, Bombay, 1968, Oxford University Press, 1969, pp. 43–73.
4. P. E. Conner and D. Montgomery, Transformation groups on a K(π, l), I, Michigan Math. J., 6 (1959), pp. 405–412.
5. P. E. Conner and Frank Raymond, Actions of compact Lie groups on aspherical manifolds, Topology of Manifolds, edited by James C. Cantrell and C. H. Edwards, Jr., pp. 227–264, Markham, Chicago, 1969.