On free group actions on n-spheres and their spherical space forms:
Ib Madsen, Charles B. Thomas, C. T. C. Wall, The topological spherical space form problem II: existence of free actions, Topology Volume 15, Issue 4, 1976, Pages 375-382 (doi:10.1016/0040-9383(76)90031-8)
Ib Madsen, Charles B. Thomas, C. T. C. Wall, Topological spherical space form problem III: Dimensional bounds and smoothing, Pacific J. Math. 106(1): 135-143 (1983) (pjm:1102721110)
Ib Madsen, Smooth spherical space forms, Geometric Applications of Homotopy Theory I. Springer 1978. 303-352 (doi:10.1007/BFb0069224, pdf)
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