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Gurvits, Grigoriy E.; Cherian, Karen; Shami, Mohamed Nafe; Korabathina, Ravikiran; El-Nader, Emad Mokhtar Abu; Rayapudi, Krishna; Gandolfo, Frederick J.; Alshumrany, Mohammad; Patel, Hiren; Chowdhury, Deepshikha N.; Tsiakos, Aris . (2015). Black Esophagus: New Insights and Multicenter International Experience in 2014. Digestive Diseases and Sciences, 60(2), 444–453. doi:10.1007/s10620-014-3382-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research