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Tran, Uyen P. N.; Le, Ky K. A.; Phan, Nam T. S.. (2011). Expanding Applications of Metal−Organic Frameworks: Zeolite Imidazolate Framework ZIF-8 as an Efficient Heterogeneous Catalyst for the Knoevenagel Reaction. , 1(2), 120–127. doi:10.1021/cs1000625 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research