@inproceedings{ove1952on,
title={On the solvability of the diophantine equation$ax$^{2}+$by$^{2}+$cz$^{2}=0 in imaginary Euclidean quadratic fields},
author={Ove Hemer},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203414346023874},
booktitle={Arkiv for Matematik},
volume={2},
number={1},
pages={57-82},
year={1952},
}
Ove Hemer. On the solvability of the diophantine equation$ax$^{2}+$by$^{2}+$cz$^{2}=0 in imaginary Euclidean quadratic fields. 1952. Vol. 2. In Arkiv for Matematik. pp.57-82. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203414346023874.