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APA Citation
Grant, S., Corbett, K., Todd, K., Davies, C., Aitchison, T., Mutrie, N., Byrne, J., Henderson, E., & Dargie, H. J. (2002). a comparison of physiological responses and rating of perceived exertion in two modes of aerobic exercise in men and women over 50 years of age. British journal of sports medicine, 36(4), 276–281. http://access.bl.uk/ark:/81055/vdc_100137792990.0x000026