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Mauldin, Timothy C.; Rule, Joseph D.; Sottos, Nancy R.; White, Scott R.; Moore, Jeffrey S. . (2007). Self-healing kinetics and the stereoisomers of dicyclopentadiene. Journal of The Royal Society Interface, 4(13), 389–393. doi:10.1098/rsif.2006.0200 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research