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Willmott, Cort J.; Ackleson, Steven G.; Davis, Robert E.; Feddema, Johannes J.; Klink, Katherine M.; Legates, David R.; O'Donnell, James; Rowe, Clinton M. . (1985). Statistics for the evaluation and comparison of models. Journal of Geophysical Research, 90(C5), 8995–. doi:10.1029/jc090ic05p08995 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research