569 citations · 2.1k across the 27 of their papers we have counts for
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astro-ph2004
Black Hole Masses of High-Redshift Quasars
M. Vestergaard
Black-hole masses of distant quasars cannot be measured directly, but can be estimated to within a factor 3 to 5 using scaling relationships involving the quasar luminosity and bro…
astro-ph2004★ 6 cited
Black-Hole Mass Measurements
M. Vestergaard
The applicability and apparent uncertainties of the techniques currently available for measuring or estimating black-hole masses in AGNs are briefly summarized.