@inproceedings{rodrigo1992the,
title={The area integral and its density for BMO and VMO functions},
author={Rodrigo Bañuelos, and Jean Brossard},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203540263225600},
booktitle={Arkiv for Matematik},
volume={31},
number={2},
pages={175-196},
year={1992},
}
Rodrigo Bañuelos, and Jean Brossard. The area integral and its density for BMO and VMO functions. 1992. Vol. 31. In Arkiv for Matematik. pp.175-196. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203540263225600.