@inproceedings{gueo2008deformations,
title={Deformations of hypercomplex structures associated to Heisenberg groups},
author={Gueo Grantcharov, Henrik Pedersen, and Yat Sun Poon},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221516652226356},
booktitle={Quarterly Journal of Mathematics},
volume={59},
number={3},
pages={335-362},
year={2008},
}
Gueo Grantcharov, Henrik Pedersen, and Yat Sun Poon. Deformations of hypercomplex structures associated to Heisenberg groups. 2008. Vol. 59. In Quarterly Journal of Mathematics. pp.335-362. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221516652226356.