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Verma, Dilip; Tasan, Ramon O.; Herzog, Herbert; Sperk, Günther; Pape, Hans-Christian . (2016). Pathways and mechanisms of NPY and Y2 receptors for controlling conditioned fear. Neuropeptides, 55(), 22–. doi:10.1016/j.npep.2015.11.062 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research