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Azhar Iqbal; Lars Frormann; Anjum Saleem; Muhammad Ishaq. (2007). The effect of filler concentration on the electrical, thermal, and mechanical properties of carbon particle and carbon fiber-reinforced poly(styrene-<em>co</em>-acrylonitrile) composites. , 28(2), 186–197. doi:10.1002/pc.20253 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research