@inproceedings{norman1963the,
title={The valuation theory of meromorphic function fields over open Riemann surfaces},
author={Norman L. Alling},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203202132150960},
booktitle={Acta Mathematica},
volume={110},
number={1},
pages={79-96},
year={1963},
}
Norman L. Alling. The valuation theory of meromorphic function fields over open Riemann surfaces. 1963. Vol. 110. In Acta Mathematica. pp.79-96. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203202132150960.