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Laborde, Sylvain; Mosley, Emma; Thayer, Julian F. . (2017). Heart Rate Variability and Cardiac Vagal Tone in Psychophysiological Research – Recommendations for Experiment Planning, Data Analysis, and Data Reporting. Frontiers in Psychology, 8(), –. doi:10.3389/fpsyg.2017.00213 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research