Some Results on Power Bounded Operators M. Radjabalipour Indiana University Mathematics Journal 1973 text pdf 10.1512/iumj.1973.22.22055 10.1512/iumj.1973.22.22055 en Indiana Univ. Math. J. 22 (1973) 673 - 677 state-of-the-art mathematics http://iumj.org/access/