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Oblak, E. Zachary; G-Dayanandan, Narendran; Wright, Dennis L. . (2011). Tandem Metathesis Reactions of Oxabicyclo[2.2.1]heptenes: Studies on the Spirocyclic Core of Cyclopamine. Organic Letters, 13(9), 2433–2435. doi:10.1021/ol200706f 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research