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Kochansky, Jan; Shimanuki, Hachiro . (1999). Development of a Gel Formulation of Formic Acid for Control of Parasitic Mites of Honey Bees. Journal of Agricultural and Food Chemistry, 47(9), 3850–3853. doi:10.1021/jf9901439 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research