@inproceedings{matts1958uniform,
title={Uniform approximation with diophantine side-conditions of continuous functions},
author={Matts Håstad},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203422942722945},
booktitle={Arkiv for Matematik},
volume={3},
number={6},
pages={487-493},
year={1958},
}
Matts Håstad. Uniform approximation with diophantine side-conditions of continuous functions. 1958. Vol. 3. In Arkiv for Matematik. pp.487-493. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203422942722945.