@inproceedings{alexander2013complete,
title={Complete monotonicity for inverse powers of some combinatorially defined polynomials},
author={Alexander D. Scott, and Alan D. Sokal},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203403911814797},
booktitle={Acta Mathematica},
volume={213},
number={2},
pages={323-392},
year={2013},
}

Alexander D. Scott, and Alan D. Sokal. Complete monotonicity for inverse powers of some combinatorially defined polynomials. 2013. Vol. 213. In Acta Mathematica. pp.323-392. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203403911814797.