Polynomial Estimates for Betti Numbers of Loop Spaces of Symmetric and Close-to-Symmetric Riemannian Manifolds Nathaniel Grossman Indiana University Mathematics Journal 1971 text pdf 10.1512/iumj.1971.20.20057 10.1512/iumj.1971.20.20057 en Indiana Univ. Math. J. 20 (1971) 717 - 731 state-of-the-art mathematics http://iumj.org/access/