@inproceedings{blair2004values,
title={Values of the Euler phi function not divisible by a given odd prime},
author={Blair K. Spearman, and Kenneth S. Williams},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203615635819877},
booktitle={Arkiv for Matematik},
volume={44},
number={1},
pages={166-181},
year={2004},
}
Blair K. Spearman, and Kenneth S. Williams. Values of the Euler phi function not divisible by a given odd prime. 2004. Vol. 44. In Arkiv for Matematik. pp.166-181. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203615635819877.