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Ruf, Fabian; Rietz, Pascal; Aygueler, Meltem F.; Kelz, Ina; Docampo, Pablo; Kalt, Heinz; Hetterich, Michael (2018): The Bandgap as a Moving Target: Reversible Bandgap Instabilities in Multiple-Cation Mixed-Halide Perovskite Solar Cells. In: ACS Energy Letters, Vol. 3, No. 12: pp. 2995-3001