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Kasdorf, Olga, Joachim Vollbrecht, Benjamin Ohms, Ulrich Hilleringmann, Harald Bock, and Heinz-Siegfried Kitzerow. “Enhanced Organic Light-Emitting Diode Based on a Columnar Liquid Crystal by Integration in a Microresonator.”https://doi.org/10.1002/er.3127__International Journal of Energy Research 38, no. 4 (2013): 452–58.https://doi.org/10.1002/er.3127 .