Guc, M.; Litvinchuk, A.P.; Levcenko, S.; Valakh, M.Y.; Bodnar, I.V.; Dzhagan, V.M.; Izquierdo-Roca, V.; Arushanov, E.; Perez-Rodriguez, A. "Optical phonons in the kesterite Cu2ZnGeS4 semiconductor: Polarized Raman spectroscopy and first-principle calculations" RSC Advances 6, 16, pp. 13278 - 13285. 2016 DOI: 10.1039/c5ra26844c