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Yuan, Wu; Stefani, Alessio; Bang, Ole . (2012). Tunable Polymer Fiber Bragg Grating (FBG) Inscription: Fabrication of Dual-FBG Temperature Compensated Polymer Optical Fiber Strain Sensors. IEEE Photonics Technology Letters, 24(5), 401–403. doi:10.1109/lpt.2011.2179927 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research