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5. German National Academy of Sciences Leopoldina & acatech - National Academy of Science and Engineering & Union of the German Academies of Sciences and Humanities Coupling the different energy sectors - options for the next phase of the energy transition 14. November 2017. https://www.acatech.de/publikation/sektorkopplung-optionen-fuer-die-naechste-phase-der-energiewende/.