Article Vigen Nikogosian, Baris Özalay, Janis Kaltschnee (E-Bridge Consulting GmbH, Bonn) and Ilona Dickschas (Siemens AG), Tim Meyerjürgens (TenneT TSO GmbH), Jens Mueller-Belau (Deutsche Shell Holding GmbH) in ew 5/2019, pages 12 ff. (German language)