Boundedness of Oscillatory Singular Integrals on Hardy Spaces: II Yibiao Pan Indiana University Mathematics Journal 1992 text pdf 10.1512/iumj.1992.41.41016 10.1512/iumj.1992.41.41016 en Indiana Univ. Math. J. 41 (1992) 279 - 293 state-of-the-art mathematics http://iumj.org/access/