@inproceedings{l.1952the,
title={The congruence$ax$^{3}+by^{3}+c≡0 (mod$xy$), and integer solutions of cubic equations in three variables},
author={L. J. Mordell},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203135624805762},
booktitle={Acta Mathematica},
volume={88},
number={1},
pages={77-83},
year={1952},
}
L. J. Mordell. The congruence$ax$^{3}+by^{3}+c≡0 (mod$xy$), and integer solutions of cubic equations in three variables. 1952. Vol. 88. In Acta Mathematica. pp.77-83. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203135624805762.