@inproceedings{annemarie2017a,
title={A characterization of Herglotz-Nevanlinna functions in two variables via integral representations},
author={Annemarie Luger, and Mitja Nedic},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180301171143963541951},
booktitle={Arkiv for Matematik},
volume={55},
year={2017},
}
Annemarie Luger, and Mitja Nedic. A characterization of Herglotz-Nevanlinna functions in two variables via integral representations. 2017. Vol. 55. In Arkiv for Matematik. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180301171143963541951.