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Kim, Inhyuk; Kim, Youngwoo; Woo, Kyoohee; Ryu, Eui-Hyun; Yon, Kyung-Yol; Cao, Guozhong; Moon, Jooho . (2013). Synthesis of oxidation-resistant core–shell copper nanoparticles. RSC Advances, 3(35), 15169–. doi:10.1039/C3RA41480A 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research