Unitary Operators Induced by Measure Preserving Transformations J. Choksi Indiana University Mathematics Journal 1967 text pdf 10.1512/iumj.1967.16.16005 10.1512/iumj.1967.16.16005 en Indiana Univ. Math. J. 16 (1967) 83 - 100 state-of-the-art mathematics http://iumj.org/access/