Schulze Steinmann, M. and Holm-Müller, K. 2010. Thuenen Rings of Biogas Production – the Effect of Differences in Transport Costs of Energy Crops in the Choice of Renewable Resources by Biogas Plants. German Journal of Agricultural Economics. 59, 1 (Mar. 2010). DOI:https://doi.org/10.52825/gjae.v59i1.1767.