1. Asoh, T.: Smooth $$S^{3}$$ S 3 -actions on $$n$$ n manifolds for $$n\le 4$$ n ≤ 4 . Hiroshima Math. J. 6(3), 619–634 (1976)
2. Barden, D.: Simply connected five-manifolds. Ann. Math. 2(82), 365–385 (1965)
3. Borel, A., Bredon, G., Floyd, E.E., Montgomery, D., Palais, R.: Seminar on transformation groups. In: Borel, A. (ed.) Annals of Mathematics Studies, vol. 46. Princeton University Press, Princeton (1960)
4. Bredon, G.E.: Introduction to Compact Transformation Groups. Pure and Applied Mathematics, vol. 46. Academic Press, New York (1972)
5. Cheeger, J., Ebin, D.G.: Comparison Theorems in Riemannian Geometry. AMS Chelsea, Providence (2008) (revised reprint of the 1975 original)