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Urick, V.J.; Godinez, M.E.; Devgan, P.S.; McKinney, J.D.; Bucholtz, F.. (2009). Analysis of an Analog Fiber-Optic Link Employing a Low-Biased Mach–Zehnder Modulator Followed by an Erbium-Doped Fiber Amplifier. jlt/27/12/jlt-27-12-2013.pdf, 27(12), 2013–2019. doi:10.1109/JLT.2008.2006283 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research