Martin Krause, Andreas Burkert, and Marc Scharmann, 'Stability of cloud orbits in the broad-line region of active galactic nuclei', Monthly Notices of the Royal Astronomical Society, Vol. 411, pp. 550-556, first published online 21 January 2011. The version of record is available online at doi: 10.1111/j.1365-2966.2010.17698.x. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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