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Löper, Philipp; Goldschmidt, Jan; Peters, Marius; Biner, Daniel; Krämer, Karl; Schultz, O; Glunz, S.W.; Luther, J (2007). Efficient upconversion systems for silicon solar cells. In: Proceeding of the 22nd European Photovoltaic Solar Energy Conference, 3.-7.9.2007, Milan (pp. 589-594). Verlag fehlt
