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Takagi, M.; Yonezawa, T.; Haga, S.; Shingu, H.; Kobayashi, Y.; Takahashi, T.; Ohtani, Y.; Obara, Y.; Katoh, K. . (2008). Changes of activity and mRNA expression of urea cycle enzymes in the liver of developing Holstein calves1. Journal of Animal Science, 86(7), 1526–1532. doi:10.2527/jas.2007-0799 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research