Weighted Norm Inequalities and Vector Valued Inequalities for Certain Rough Operators Steve Hofmann Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42001 10.1512/iumj.1993.42.42001 en Indiana Univ. Math. J. 42 (1993) 1 - 14 state-of-the-art mathematics http://iumj.org/access/