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Dong, Lifang; Ran, Junxia; Mao, Zhiguo . (2005). Direct measurement of electron density in microdischarge at atmospheric pressure by Stark broadening. Applied Physics Letters, 86(16), 161501–. doi:10.1063/1.1906299 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research