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Kagawa, Hiroko; Seki, Yoshimasa; Okanoya, Kazuo . (2017). Affective valence of neurons in the vicinity of the rat amygdala: Single unit activity in response to a conditioned behavior and vocal sound playback. Behavioural Brain Research, 324(), 109–114. doi:10.1016/j.bbr.2017.02.022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research