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Heather M. B. MacRitchie; Christopher Longbottom; Margaret Robertson; Zoann Nugent; Karen Chan; John R. Radford; Nigel B. Pitts. (2012). Development of the Dundee Caries Risk Assessment Model (DCRAM) – risk model development using a novel application of CHAID analysis. , 40(1), 37–45. doi:10.1111/j.1600-0528.2011.00630.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research