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Feng, J.; Liu, X.; Xu, Z. R.; Wang, Y. Z.; Liu, J. X. . (2007). Effects of Fermented Soybean Meal on Digestive Enzyme Activities and Intestinal Morphology in Broilers. Poultry Science, 86(6), 1149–1154. doi:10.1093/ps/86.6.1149 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research