@inproceedings{l.1963on,
title={On Lerch's class number formulae for binary quadratic forms},
author={L. J. Mordell},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203429973713007},
booktitle={Arkiv for Matematik},
volume={5},
number={1},
pages={97-100},
year={1963},
}