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2. Measuring landscape esthetics: the scenic beauty estimation method;Daniel;USDA Forest Service Research Paper RM-167,1976
3. Quantitative evaluation of landscapes: An application of signal detection analysis to forest management alternatives;Daniel;Man-Envir. Syst.,1973
4. Signal Detection Theory and psychophysics;Green,1966
5. Relationships between air quality and human perceptions of scenic areas;Latimer,1980