@inproceedings{richard1985interaction,
title={Interaction of progressing waves for semilinear wave equations. II},
author={Richard B. Melrose, and Niles Ritter},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203523573975458},
booktitle={Arkiv for Matematik},
volume={25},
number={1},
pages={91-114},
year={1985},
}
Richard B. Melrose, and Niles Ritter. Interaction of progressing waves for semilinear wave equations. II. 1985. Vol. 25. In Arkiv for Matematik. pp.91-114. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203523573975458.