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Hsieh, Yi-Chang; Peng, Tz-Shiuan; Wang, Lon A. . (2012). Millimeter-Sized Microfiber Coil Resonators With Enhanced Quality Factors by Increasing Coil Numbers. IEEE Photonics Technology Letters, 24(7), 569–571. doi:10.1109/lpt.2012.2183673 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research