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Eremeykin, Oleg N.; Antipov, Oleg L.; Minassian, Ara; Damzen, Michael J.. (2004). Efficient continuous-wave generation in a self-organizing diode-pumped Nd:YVO4 laser with a reciprocal dynamic holographic cavity. ol/29/20/ol-29-20-2390.pdf, 29(20), 2390–0. doi:10.1364/OL.29.002390 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research