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Ikeda, K.; Nakano, H.; Tsumori, K.; Kisaki, M.; Nagaoka, K.; Osakabe, M.; Takeiri, Y.; Kaneko, O. . (2014). Development of spectrally selective imaging system for negative hydrogen ion sourcea). Review of Scientific Instruments, 85(2), 02A724–. doi:10.1063/1.4842318 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research