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G. Gouadec; J.-P. Forgerit; Ph. Colomban. (2002). Choice of the working conditions for Raman extensometry of carbon and SiC fibers by 2D correlation. , 62(4), 505–511. doi:10.1016/s0266-3538(01)00141-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research