@inproceedings{tze-ming1994asymptotic,
title={Asymptotic expansions of matrix coefficients of Whittaker vectors at irregular singularities},
author={Tze-Ming To},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203325752396524},
booktitle={Acta Mathematica},
volume={175},
number={2},
pages={227-271},
year={1994},
}
Tze-Ming To. Asymptotic expansions of matrix coefficients of Whittaker vectors at irregular singularities. 1994. Vol. 175. In Acta Mathematica. pp.227-271. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203325752396524.