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Chandler, D.; Sunderland, K. D.; Ball, B. V.; Davidson, G. . (2001). Prospective Biological Control Agents of Varroa destructor n. sp., an Important Pest of the European Honeybee, Apis mellifera. Biocontrol Science and Technology, 11(4), 429–448. doi:10.1080/09583150120067472 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research