Markoff S., D. Russell, J. Dexter, O. Pfuhl, F. Eisenhauer, R. Abuter, J. Miller-Jones, and T.D. Russell, Monthly Notices Of The Royal Astronomical Society495, 525–535(2020).
Kalemci E., M.C. Begelman, T.J. Maccarone, T. Dincer, T.D. Russell, C. Bailyn, and J.A. Tomsick, Monthly Notices Of The Royal Astronomical Societystw2002(2016).