Figure 6: The number of citations to the Shakura & Sunyaev paper [279] is still growing
exponentially, implying that the field of black hole accretion disk theory still has not reached
saturation. Image reproduced from the SAO/NASA Astrophysics Data System, URL (accessed 9 Jan
2013): http://adsabs.harvard.edu/abs/1973A&A....24..337S.
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