@inproceedings{anna2012on,
title={On the weak-type (1,1) of the uncentered Hardy–Littlewood maximal operator associated with certain measures on the plane},
author={Anna K. Savvopoulou, and Christopher M. Wedrychowicz},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203637877654063},
booktitle={Arkiv for Matematik},
volume={52},
number={2},
pages={367-382},
year={2012},
}

Anna K. Savvopoulou, and Christopher M. Wedrychowicz. On the weak-type (1,1) of the uncentered Hardy–Littlewood maximal operator associated with certain measures on the plane. 2012. Vol. 52. In Arkiv for Matematik. pp.367-382. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203637877654063.