1. Borg, G. A. V. Interindividual scaling and perception of muscu-lar force. Kungliga Fysiografiska Sällskapets Förhandlingar, 1961, 12, 117–125.
2. Borg, G. A. V. Physical performance and perceived exertion, Lund: Gleerup, 1962.
3. Marks, L. E. Relative sensitivity and possible psychophysical functions. Sensory Processes, 1977, 1, 301–315.
4. Marks, L. E. A theory of loudness and loudness judgments. Psychological Review, 1979, 86, 256–285.
5. Mountcastle, V. B., Poggio, G. F., & Werner, G. The relation of thalamic cell response to peripheral stimuli varied over an intensive continuum. Journal of Neurophysiology, 1963, 26, 807–834.