@inproceedings{robert1967generalized,
title={Generalized bernoulli numbers and the theory of cyclotomic fields},
author={Robert Segal},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203215183334059},
booktitle={Acta Mathematica},
volume={121},
number={1},
pages={49-75},
year={1967},
}
Robert Segal. Generalized bernoulli numbers and the theory of cyclotomic fields. 1967. Vol. 121. In Acta Mathematica. pp.49-75. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203215183334059.