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Hu, Sheng; Hu, Zhenming; Wang, Qiaoyun . (2017). Determination of hexavalent chromium with a high-performance optical microring resonator. Instrumentation Science & Technology, (), 1–12. doi:10.1080/10739149.2017.1296860 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research