@inproceedings{g.1916l'some,
title={l'Some problems of diophantine approximation’, acta mathematica},
author={G. H. Hardy, and J. E. Littlewood},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203033093233283},
booktitle={Acta Mathematica},
volume={41},
number={1},
pages={196-196},
year={1916},
}
G. H. Hardy, and J. E. Littlewood. l'Some problems of diophantine approximation’, acta mathematica. 1916. Vol. 41. In Acta Mathematica. pp.196-196. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203033093233283.