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2. Interindividual scaling and perception of muscular force;Borg;Kungliga fysiografiska sällskapets i Lund förhandlingar,1961
3. Physical performance and perceived exertion;Borg,1962
4. A ratio scaling method for interindividual comparisons;Borg,1972
5. A category scale with ratio properties for intermodal and interindividual comparisons;Borg,1982