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Woehrlin, Friederike; Fry, Hildburg; Abraham, Klaus; Preiss-Weigert, Angelika . (2010). Quantification of Flavoring Constituents in Cinnamon: High Variation of Coumarin in Cassia Bark from the German Retail Market and in Authentic Samples from Indonesia. Journal of Agricultural and Food Chemistry, 58(19), 10568–10575. doi:10.1021/jf102112p 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research