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Sakirkin, Sharon L. P.; Morgan, Cristine L. S.; MacDonald, James C.; Auvermann, Brent W.. (2011). Effect of Diet Composition on the Determination of Ash and Moisture Content in Solid Cattle Manure Using Visible and Near-Infrared Spectroscopy. as/65/9/as-65-9-1056.pdf, 65(9), 1056–1061. doi:10.1366/11-06333 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research