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Berrettoni, C.; Trono, C.; Vignoli, V.; Baldini, F. . (2015). Fibre Tip Sensor with Embedded FBG-LPG for Temperature and Refractive Index Determination by means of the Simple Measurement of the FBG Characteristics. Journal of Sensors, 2015(), 1–8. doi:10.1155/2015/491391 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research