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2001 · Andrea Beste, Ulrich Hampl, et al. · Organic Eprints (International Centre for Research in Organic Food Systems, and Research Institute of Organic Agriculture) · 3
2000 · G. Eysel, Ulrich Hampl, et al. · IFOAM 2000: the world grows organic. Proceedings 13th International IFOAM Scientific Conference, Basel, Switzerland, 28 to 31 August, 2000.