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Michaelis, M. M.; Dempers, C. A.; Kosch, M.; Prause, A.; Notcutt, M.; Cunningham, P. F.; Waltham, J. A.. (1991). A gas-lens telescope. , 353(6344), 547–548. doi:10.1038/353547a0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research