@inproceedings{charles1969inequalities,
title={Inequalities for strongly singular convolution operators},
author={Charles Fefferman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203219190181087},
booktitle={Acta Mathematica},
volume={124},
number={1},
pages={9-36},
year={1969},
}