@inproceedings{christian2007la, title={La somme des chiffres des carrés}, author={Christian Mauduit, and Joël Rivat}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203354084370716}, booktitle={Acta Mathematica}, volume={203}, number={1}, pages={107-148}, year={2007}, }