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Ozawa, Takaaki; Ycu, Edgar A; Kumar, Ashwani; Yeh, Li-Feng; Ahmed, Touqeer; Koivumaa, Jenny; Johansen, Joshua P . (2016). A feedback neural circuit for calibrating aversive memory strength. Nature Neuroscience, (), –. doi:10.1038/nn.4439 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research