@inproceedings{j.1950the,
title={The rational solutions of the diophantine equation},
author={J. W. S. Cassels},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203127435790704},
booktitle={Acta Mathematica},
volume={82},
number={1},
pages={243-273},
year={1950},
}