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Childs, Charmaine; Ng, Angela Li Ching; Liu, Kun; Pan, Jianxin . (2011). Exploring the sources of ‘missingness’ in brain tissue monitoring datasets: An observational cohort study. Brain Injury, 25(12), 1163–1169. doi:10.3109/02699052.2011.607791 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research