@inproceedings{gordon1975stability,
title={Stability of unfoldings in space and time},
author={Gordon Wassermann},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203236811160191},
booktitle={Acta Mathematica},
volume={135},
number={1},
pages={57-128},
year={1975},
}