Weighted norm inequalities for integral transforms Elijah Liflyand Indiana University Mathematics Journal 2018 text pdf 10.1512/iumj.2018.67.7470 10.1512/iumj.2018.67.7470 en Indiana Univ. Math. J. 67 (2018) 1949 - 2003 state-of-the-art mathematics http://iumj.org/access/