Olar T., Lauermann I., Xie H., Neuschitzer M., Saucedo E., Calvet W., Steigert A., Ümsür B., Chacko B., Parvan V., Gorgoi M., Senkovskiy B., Lux-Steiner M.C. "Assessment of Chemical and Electronic Surface Properties of the Cu2ZnSn(SSe)4 after Different Etching Procedures by Synchrotron-based Spectroscopies" Energy Procedia 84, pp. 8 - 16. 2015 DOI: 10.1016/j.egypro.2015.12.289