The Complete Solution to the (L^p, L^q) Mapping Problem for a Class of Oscillating Kernels W. JurkatG. Sampson Indiana University Mathematics Journal 1981 text pdf 10.1512/iumj.1981.30.30031 10.1512/iumj.1981.30.30031 en Indiana Univ. Math. J. 30 (1981) 403 - 413 state-of-the-art mathematics http://iumj.org/access/