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APA Citation
Graham, M. J., Ross, N. P., Stern, D., Drake, A. J., McKernan, B., Ford, K. E. S., Djorgovski, S. G., Mahabal, A. A., Glikman, E., Larson, S., & Christensen, E. (2020). understanding extreme quasar optical variability with CRTS – II. Changing-state quasars. Monthly notices of the Royal Astronomical Society, 491(4), 4925–4948. http://access.bl.uk/ark:/81055/vdc_100098454292.0x000041