@inproceedings{yat1995generalised,
  title={Generalised connected sums of quaternionic manifolds},
  author={Yat Sun Poon, and Andrew Swann},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221755196181365},
  booktitle={Annals of Global Analysis and Geometry},
  volume={13},
  number={1},
  pages={79-90},
  year={1995},
}
             
            
                
Yat Sun Poon, and Andrew Swann. Generalised connected sums of quaternionic manifolds. 1995. Vol. 13. In Annals of Global Analysis and Geometry. pp.79-90. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221755196181365.