@inproceedings{tianjun2015almost,
title={Almost Kähler forms on rational 4-manifolds},
author={Tianjun Li, and Weiyi Zhang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170530145921482366765},
booktitle={Amer. J. Math.},
volume={137},
number={5},
pages={1209–1256},
year={2015},
}