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LI, HUAIXIANG; XUE, CHENGSHAN; ZHANG, HUA; GUO, CHENGHUA; LI, CHUANBO; CHEN, LUSHENG; DIAO, ZHAOYU . (2002). ELECTROPHORETIC ASSEMBLY OF POROUS SILICON. International Journal of Modern Physics B, 16(28n29), 4306–4309. doi:10.1142/S0217979202015315 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research