Levcenko, S., Hajdeu-Chicarosh, E., Serna, R., Guc, M., Victorov, I.A., Nateprov, A., Bodnar, I.V., Caballero, R., Merino, J.M., Arushanov, E., León, M. "Spectroscopic ellipsometry study of Cu2ZnSn(SxSe1-x)4 bulk polycrystals" Journal of Alloys and Compounds 843, pp. 156013 - 2020 DOI: 10.1016/j.jallcom.2020.156013