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Knight, J; Jiang, J; Assimos, D G; Holmes, R P . (2006). Hydroxyproline ingestion and urinary oxalate and glycolate excretion. Kidney International, (0), 116–119. doi:10.1038/sj.ki.5001906 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research