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| OPPOSITION | - Anonymous, "Leitfaden Biogas$", Fördergesellschaft für nachhaltige Biogas und Bioenergienutzung (FnBB), Österreich, (20090000), pages 1 - 28, XP055733571 | 
| OPPOSITION | - CAHYARI, K. et al., "Design of Biogas Plant from Fruit Market Waste in Indonesia", Renews 2010 - Renewable Energy Conference, Berlin, Germany, (20101012), pages 1 - 8, XP055733504 | 
| OPPOSITION | - Felipe Kaiser, Tim Metzner, Mathias Effenberger, Andreas Gronauer, SICHERUNG DER PROZESSSTABILITÄT IN LANDWIRTSCHAFTLICHEN BIOGASANLAGEN, Bayerische Landesanstalt fur Landwirtschaft /LFL/, (20080000), pages 5pp, 6 - 14, XP055733552 | 
| OPPOSITION | - HECHT, MELANIE, "Die Bedeutung des Carbonat-Puffersystems für die Stabilität des Gärprozesses landwirtschaftlicher Biogasanlagen", Inaugural-Dissertation, Rheinische Friedrich-Wilhelms-Universität zu Bonn, (20090000), pages I-VIII, 1 - 104, XP055733506 | 
| OPPOSITION | - MCCARTY, P.L., "Anaerobic Waste Treatment Fundamentals- Part Four- Proess Design", Public Works, (19641200), pages 95 - 99, XP055160652 | 
| OPPOSITION | - MCCARTY, P.L., "Anaerobic Waste Treatment Fundamentals- Part three- Toxic Materials and Their Control", Public Works, (19641100), pages 91 - 94, XP055160652 | 
| OPPOSITION | - MCCARTY, P.L., "Anaerobic Waste Treatment Fundamentals- Part Two- Environmental Requirements and Control", Public Works, (19641000), pages 123 - 126, XP009168583 | 
| OPPOSITION | - "Monitoring of process stability in biogas plants by determination of the hydrogen carbonate buffer system", M. Hecht, R. Buschmann, J. Hoffmann, S. Wulf, J. Clemens, VDLUFA-Schriftenreihe 63, Kongressband, (20070000), pages 297 - 300, XP055732942 | 
| OPPOSITION | - Perry L Mccarty, "Anaerobic Waste Treatment Fundamentals - Part One - Chemistry and Microbiology", PUBLIC WORKS,, (19640900), pages 107 - 112, XP055160652 | 
| OPPOSITION | - SAWYER, C. N. et al., "SCIENTIFIC BASIS FOR LIMING OF DIGESTERS", SEWAGE AND INDUSTRIAL WASTES, (19540000), pages 935 - 944, XP055733590 | 
| OPPOSITION | - SCHIELE, W. et al., Kalk Herstellung-Eigenschaften-Verwendung, Düsseldorf, Verlag Stahleisen Dusseldorf, (19720000), pages 2pp, 262 - 267, XP055733546 | 
| OPPOSITION | - F. RAPOSO et al., "Anaerobic digestion of solid organic substrates in batch mode: An overview relating to methane yields and experimental procedures", Renewable and Sustainable Energy Reviews, (20110000), vol. 16, doi:10.1016/j.rser.2011.09.008, pages 861 - 877, XP055337976 |