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Löper, P.; Goldschmidt, J.C.; Fischer, S.; Peters, M.; Meijerink, A.; Biner, Daniel; Krämer, Karl; Schultz-Wittmann, O.; Glunz, S.W.; Luther, J. (2009). Upconversion for silicon solar cells: Material and system characterization. European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), pp. 173-180. 10.4229/23rdEUPVSEC2008-1CO.3.1
