@inproceedings{conan2010almost,
title={Almost toric symplectic four-manifolds},
author={Conan Leung, and Margaret Symington},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160830143735659315558},
booktitle={Journal of Symplectic Geometry},
volume={8},
number={2},
pages={143-187},
year={2010},
}

Conan Leung, and Margaret Symington. Almost toric symplectic four-manifolds. 2010. Vol. 8. In Journal of Symplectic Geometry. pp.143-187. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160830143735659315558.