@inproceedings{robert1989hankel,
title={Hankel operators between weighted Bergman spaces in the ball},
author={Robert Wallstén},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532421823534},
booktitle={Arkiv for Matematik},
volume={28},
number={1},
pages={183-192},
year={1989},
}
Robert Wallstén. Hankel operators between weighted Bergman spaces in the ball. 1989. Vol. 28. In Arkiv for Matematik. pp.183-192. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532421823534.