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Ting, Ching-Heng; Chen, Ying-Chieh; Liaw, Wen-Jinn; Lin, Han-Chieh; Chen, Chih-Yen . (2016). Peripheral injection of pancreatic polypeptide enhances colonic transit without eliciting anxiety or altering colonic secretion in rats. Neuropeptides, 55(), 67–71. doi:10.1016/j.npep.2015.10.002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research