@inproceedings{jan-olov1976weak,
title={Weak estimates on maximal functions with rectangles in certain directions},
author={Jan-Olov Strömberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203501431102273},
booktitle={Arkiv for Matematik},
volume={15},
number={1},
pages={229-240},
year={1976},
}
Jan-Olov Strömberg. Weak estimates on maximal functions with rectangles in certain directions. 1976. Vol. 15. In Arkiv for Matematik. pp.229-240. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203501431102273.