L(p,\infty)* M. CwikelY. Sagher Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21062 10.1512/iumj.1972.21.21062 en Indiana Univ. Math. J. 21 (1972) 781 - 786 state-of-the-art mathematics http://iumj.org/access/