@inproceedings{bo2007backlund,
title={BACKLUND TRANSFORMATIONS, WARD SOLITONS,AND UNITONS},
author={Bo Dai, and Chuu-Lian Terng},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160908185022238976659},
booktitle={Journal of Differential Geometry},
volume={75},
pages={57-108},
year={2007},
}

Bo Dai, and Chuu-Lian Terng. BACKLUND TRANSFORMATIONS, WARD SOLITONS,AND UNITONS. 2007. Vol. 75. In Journal of Differential Geometry. pp.57-108. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160908185022238976659.