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Burgess, Rebecca; Buono, Carlo; Davies, Philip R.; Davies, Robert J.; Legge, Thomas; Lai, Amy; Lewis, Ryan; Morgan, David J.; Robinson, Neil; Willock, David J. . (2015). The functionalisation of graphite surfaces with nitric acid: Identification of functional groups and their effects on gold deposition. Journal of Catalysis, 323(), 10–18. doi:10.1016/j.jcat.2014.12.021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research