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Yu, B.; Lee, T.T.T.; Chiou, P.W.-S. . (2002). Effects of sources of protein and enzyme supplementation on protein digestibility and chyme characteristics in broilers. British Poultry Science, 43(3), 424–431. doi:10.1080/00071660120103701 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research