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Rahaman, M.S.; Mavinic, D. S.; Bhuiyan, M.I.H.; Koch, F. A. . (2006). Exploring the Determination of Struvite Solubility Product from Analytical Results. Environmental Technology, 27(9), 951–961. doi:10.1080/09593332708618707 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research