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Geidl, Wolfgang; Schlesinger, Sabrina; Mino, Eriselda; Miranda, Lorena; Pfeifer, Klaus . (2020). Dose–response relationship between physical activity and mortality in adults with noncommunicable diseases: a systematic review and meta-analysis of prospective observational studies. International Journal of Behavioral Nutrition and Physical Activity, 17(1), 109–. doi:10.1186/s12966-020-01007-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research