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Z. -C. Luo; J. -R. Liu; H. -Y. Wang; A. -P. Luo; W. -C. Xu. (2012). Wide-band tunable passively Q-switched all-fiber ring laser based on nonlinear polarization rotation technique. , 22(1), 203–206. doi:10.1134/s1054660x11230125 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research