With a little help from a stranger:the impact of external change agents on corporate sustainability investments Hoppmann, Jörn Sakhel, Alice Richert, Marcel 2018 - Forschungsinformationssystem der UHH
Governing the German Energy Transition - Lessons from the Case of Solar Photovoltaic Power : CGG Lecture Series Hoppmann, Jörn 2015 - Lecture2Go UHH - frei zugänglich