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Zhang, X.; Zhao, L.; Cao, F.; Ahmad, H.; Wang, G.; Wang, T. . (2013). Effects of feeding fermented Ginkgo biloba leaves on small intestinal morphology, absorption, and immunomodulation of early lipopolysaccharide-challenged chicks. Poultry Science, 92(1), 119–130. doi:10.3382/ps.2012-02645 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research