Quantifying redox-induced Schottky barrier variations in memristive devices via in operando spectromicroscopy with graphene electrodes oleh Christoph Baeumer, Christoph Schmitz, Astrid Marchewka, David N. Mueller, Richard Valenta, Johanna Hackl, Nicolas Raab, Steven P. Rogers, M. Imtiaz Khan, Slavomir Nemsak, Moonsub Shim, Stephan Menzel, Claus Michael Schneider, Rainer Waser, Regina Dittmann