Firms’ transition towards green product service system innovators Tietze, Frank Schiederig, Tim Herstatt, Cornelius 2011 - TUHH Open Research - frei zugänglich
What is Green Innovation? : A quantitative literature review Schiederig, Tim Tietze, Frank Herstatt, Cornelius 2011 - TUHH Open Research - frei zugänglich