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Pivnichny, James V.; Arison, Byron H.; Preiser, Franz A.; Shim, Jung Sook K.; Mrozik, Helmut . (1988). Base-catalyzed isomerization of avermectins. Journal of Agricultural and Food Chemistry, 36(4), 826–828. doi:10.1021/jf00082a039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research