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Choo, Thye Foo; Mohd Salleh, Mohamad Amran; Kok, Kuan Ying; Matori, Khamirul Amin; Abdul Rashid, Suraya . (2020). Effect of Temperature on Morphology, Phase Transformations and Thermal Expansions of Coal Fly Ash Cenospheres. Crystals, 10(6), 481–. doi:10.3390/cryst10060481 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research