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Mishra, Sabyasachi; Meda, Venkatesh; Dalai, Ajay . (2006). Permittivity of Naphthenic Acid-Water Mixture. Journal of Microwave Power and Electromagnetic Energy, 41(2), 18–29. doi:10.1080/08327823.2006.11688554 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research