Ab initio study of phonon dispersion and thermodynamic properties of pure and doped pyritesAbolore A. Musari, Daniel P. Joubert, Joseph A. Olowofela, Adio T. Akinwale and Gboyega A. AdebayoEur. Phys. J. B, 90 12 (2017) 254DOI: https://doi.org/10.1140/epjb/e2017-80508-6