@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}, }