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G. C. Barris; D. Krouse; C. Hatchwell. (2001). Densification of reaction bonded O-sialon: A graphical experimental approach for optimising process parameters. , 36(14), 3373–3378. doi:10.1023/a:1017987323967 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research