2008 · Martin Holpp, R. Kaufmann · Agricultural and biosystems engineering for a sustainable world. International Conference on Agricultural Engineering, Hersonissos, Crete, Greece, 23-25 June, 2008 · 1
2005 · F. Strasser, Thomas Alföldi, et al. · Organic Eprints (International Centre for Research in Organic Food Systems, and Research Institute of Organic Agriculture)