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Iason, G. R.; O'Reilly-Wapstra, J. M.; Brewer, M. J.; Summers, R. W.; Moore, B. D. . (2011). Do multiple herbivores maintain chemical diversity of Scots pine monoterpenes?. Philosophical Transactions of the Royal Society B: Biological Sciences, 366(1569), 1337–1345. doi:10.1098/rstb.2010.0236 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research