Giraldo S., Kim S., Andrade-Arvizu J.A., Alcobé X., Malerba C., Valentini M., Tampo H., Shibata H., Izquierdo-Roca V., Pérez-Rodríguez A., Saucedo E. "Study and optimization of alternative MBE-deposited metallic precursors for highly efficient kesterite CZTSe:Ge solar cells" Progress in Photovoltaics: Research and Applications 27, 9, pp. 779 - 788. 2019