Diffeomorphism Groups of Cobordant Manifolds Youn Lee Indiana University Mathematics Journal 1978 text pdf 10.1512/iumj.1978.27.27049 10.1512/iumj.1978.27.27049 en Indiana Univ. Math. J. 27 (1978) 759 - 777 state-of-the-art mathematics http://iumj.org/access/