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Pavel, E.; Jinga, S.I.; Vasile, B.S.; Dinescu, A.; Trusca, R.; Tosa, N. . (2015). 3D direct laser writing of Petabyte Optical Disk. Optics & Laser Technology, 71(), 45–49. doi:10.1016/j.optlastec.2015.02.011 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research