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M. S. Kozlova; N. V. Karyakin; M. S. Sheiman; V. N. Larina; G. P. Kamelova. (2004). Thermodynamic Properties of Formylferrocene. , 74(3), 341–345. doi:10.1023/b:rugc.0000030388.49873.e5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research