@inproceedings{harish-chandra1964discrete,
title={Discrete series for semisimple Lie groups I},
author={Harish-Chandra},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203206086662993},
booktitle={Acta Mathematica},
volume={113},
number={1},
pages={241-318},
year={1964},
}