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Martsinkevich, E. M.; Bruk, L. G.; Dashko, L. V.; Afaunov, A. A.; Flid, V. R.; Sedov, I. V. . (2018). Catalytic Reactions of Homo- and Cross-Condensation of Ethanal and Propanal. Petroleum Chemistry, 58(12), 1032–1035. doi:10.1134/S0965544118120083 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research