@inproceedings{r.1976unitary,
title={Unitary representations defined by boundary conditions—the case of sl(2,$R$)},
author={R. Ranga Rao},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203243611229227},
booktitle={Acta Mathematica},
volume={139},
number={1},
pages={185-216},
year={1976},
}
R. Ranga Rao. Unitary representations defined by boundary conditions—the case of sl(2,$R$). 1976. Vol. 139. In Acta Mathematica. pp.185-216. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203243611229227.