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Graphene based electron field emitterWenger, Christian; Kitzmann, Julia; Wolff, André; Fraschke, Mirko; Walczyk, Christian; Lupina, Gregorz; Mehr, Wolfgang; Junige, Marcel; Albert, Matthias; Bartha, Johann W. · Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena · 2015