If you use Atomsk in your work, the citation of the following article will be greatly appreciated:

"Atomsk: A tool for manipulating and converting atomic data files"
Pierre Hirel, Comput. Phys. Comm. 197 (2015) 212-219
doi:10.1016/j.cpc.2015.07.012

BibTeX entry:

@article{Atomsk,
title = "Atomsk: A tool for manipulating and converting atomic data files",
journal = "Computer Physics Communications",
volume = "197",
number = "5",
pages = "212-219",
year = "2015",
issn = "0010-4655",
doi = "10.1016/j.cpc.2015.07.012",
url = "https://www.sciencedirect.com/science/article/pii/S0010465515002817",
author = "Pierre Hirel"
}