Mayer, V. .; Schlick, M. .; Groeger, M. . Landscape As a Soft Locational Factor: The Development of Guidelines, Targets and Project-Based Proposals for Action to Secure and Develop Aesthetic Landscape Qualities. RuR 2001, 59 (2-3), 131–141. https://doi.org/10.1007/BF03184348.