3-Manifolds with Geometric Structure and Approximate Fibrations R. Daverman Indiana University Mathematics Journal 1991 text pdf 10.1512/iumj.1991.40.40065 10.1512/iumj.1991.40.40065 en Indiana Univ. Math. J. 40 (1991) 1451 - 1469 state-of-the-art mathematics http://iumj.org/access/