On some Properties of Composition Operators Joseph CimaJames ThomsonW. Wogen Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24018 10.1512/iumj.1975.24.24018 en Indiana Univ. Math. J. 24 (1975) 215 - 220 state-of-the-art mathematics http://iumj.org/access/