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Sanamyan, T.; Kanskar, M.; Xiao, Y.; Kedlaya, D.; Dubinskii, M.. (2011). High power diode-pumped 27-μm Er^3+:Y_2O_3 laser with nearly quantum defect-limited efficiency. oe/19/S5/oe-19-S5-A1082.pdf, 19(0), 0–0. doi:10.1364/OE.19.0A1082 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research