@inproceedings{lars1953on,
title={On a class of diophantine equations of the second degree in imaginary quadratic fields},
author={Lars Fjellstedt},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203417164285894},
booktitle={Arkiv for Matematik},
volume={2},
number={5},
pages={435-461},
year={1953},
}
Lars Fjellstedt. On a class of diophantine equations of the second degree in imaginary quadratic fields. 1953. Vol. 2. In Arkiv for Matematik. pp.435-461. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203417164285894.