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Wirch, Jennifer L; Wolfe, Larry A; Weissgerber, Tracey L; Davies, Gregory A.L . (2006). Cold pressor test protocol to evaluate cardiac autonomic function. Applied Physiology, Nutrition, and Metabolism, 31(3), 235–243. doi:10.1139/h05-018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research