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Malone, Brendan P.; de Gruijter, Jaap J.; McBratney, Alex B.; Minasny, Budiman; Brus, Dick J. . (2011). Using Additional Criteria for Measuring the Quality of Predictions and Their Uncertainties in a Digital Soil Mapping Framework. Soil Science Society of America Journal, 75(3), 1032–. doi:10.2136/sssaj2010.0280 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research