Roth, Michael, and Dietwald Gruehn. “Methods and Data to Describe Agricultural Landscapes and Their Cultural Values on National Level in Germany: Confusing Coexistence or Multilayered Complexity?”. JOURNAL OF LANDSCAPE ECOLOGY, vol. 8, no. Suppl.1, Dec. 2010, pp. 53-66, https://doi.org/10.56617/tl.4049.