Reise, Christian, Ulf Liebe, and Oliver Mußhoff. “Farmers’ Preferences Regarding the Design of Substrate Supply Contracts for Biogas Plants: A Choice Experiment”. German Journal of Agricultural Economics 61, no. 3 (September 1, 2012). Accessed June 26, 2025. https://www.tib-op.org/ojs/index.php/gjae/article/view/1877.