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Hamlin, M. , Manimmanakorn, A. , Sandercock, G. , Ross, J. , Creasy, R. , Hellemans, J.. "Heart Rate Variability in Responders and Non- Responders to Live-Moderate, Train-Low Altitude Training". World Academy of Science, Engineering and Technology, Open Science Index 53, International Journal of Sport and Health Sciences (2011), 5(5), 810 - 814.