1. H. Hopf, Foreword in Ref. [2], p. XXIII.
2. Biorefineries—Industrial Processes and Products (Eds.: ), Wiley-VCH, Weinheim, 2007.
3. National Renewable Energy Laboratory (NREL); http://www.nrel.gov/biomass/biorefinery.html.
4. European Technology Platform for Sustainable Chemistry, Industrial Biotechnology Section, 2005, http://www.suschem.org.
5. D. Peters, Fachagentur nachwachsende Rohstoffe, Anbau und Nutzung Nachwachsender Rohstoffe in Deutschland (Agency of Renewable Resources, Cultivation and Utilization of Renewable Resources in Germany), 2005, http://www.fnr.de.