@inproceedings{jürgen1982normal,
title={Normal forms for real surfaces in C^{2}near complex tangents and hyperbolic surface transformations},
author={Jürgen K. Moser, and Sidney M. Webster},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203259398309335},
booktitle={Acta Mathematica},
volume={150},
number={1},
pages={255-296},
year={1982},
}
Jürgen K. Moser, and Sidney M. Webster. Normal forms for real surfaces in C^{2}near complex tangents and hyperbolic surface transformations. 1982. Vol. 150. In Acta Mathematica. pp.255-296. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203259398309335.