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Serwinski, Bianca; Salavecz, Gyöngyvér; Kirschbaum, Clemens; Steptoe, Andrew . (2016). Associations between hair cortisol concentration, income, income dynamics and status incongruity in healthy middle-aged women. Psychoneuroendocrinology, 67(), 182–188. doi:10.1016/j.psyneuen.2016.02.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research