@article{articleac9ce0b8,
title   = {Popratio: A program to calculate atomic level populations in astrophysical plasmas},
author = {Silva, A. I. and Viegas, Sueli Maria Marino},
year = {2001},
doi = {10.1016/s0010-4655(01)00149-7},
journal   = {Computer Physics Communications}
}