References Amberger Kühltechnik (Germany) Audi (Germany) Beiersdorf (Germany) Bitburger (Germany) BMW (Germany) Brau Union (Austria) Cactus Howald (Luxembourg) Cölner Hofbräu P. Josef Früh KG (Germany) FEV Motorentechnik (Germany, China) Ford (Germany, USA) Grünenthal (Germany) Hofstetter (France) Hutchinson (Germany, France) Ikea Istanbul (Turkey) Johnson Controls (Germany) Linde (Austria) Mapa in Liancourt (France) Opel (Germany) Parc du Canal (Luxembourg) Praxair (Spain) Prinovis (Germany, Great Britain) Procter & Gamble (world-wide) Rhön Energiesystem (Germany) RWTH Aachen (Germany) Shandong Minghe Poultry Biogas Plant (China) Toyota (France) TS-Umweltanlagenbau (Germany) Volkswagen (Germany)