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APA Citation
Timlin, J. D., Brandt, W. N., Ni, Q., Luo, B., Pu, X., Schneider, D. P., Vivek, M., & Yi, W. (2020). the correlations between optical/UV broad lines and X-ray emission for a large sample of quasars. Monthly notices of the Royal Astronomical Society, 492(1), 719–741. http://access.bl.uk/ark:/81055/vdc_100098770153.0x000052