Janssens, Marc, Hartmut Gaese, Norbert Keutgen, Rodrigo Ortega, Juan Carlos Torrico, and Juergen Pohlan. “Fundaments of Agricultural Sustainability or the Quest for the Golden Fleece”. JNRD - Journal of Natural Resources and Development 4 (June 5, 2014): 34–45. Accessed May 1, 2026. https://benelux.ub.uni-koeln.de/ojs33017/index.php/JNRD/article/view/690.