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Weller, A. S.; Millard, C. E.; Stroud, M. A.; Greenhaff, P. L.; Macdonald, I. A. . (1997). Physiological responses to cold stress during prolonged intermittent low- and high-intensity walking. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 272(6), R2025–R2033. doi:10.1152/ajpregu.1997.272.6.r2025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research