Matter Outflows from AGN: A Unifying Model
  We discuss a self-consistent unified model of the matter outflows from AGNs based on a theoretical approach and involving data on AGN evolution and structure. The model includes a unified geometry, two-phase gas dynamics, radiation transfer, and absorption spectrum calculations in the UV and X-ray bands. We briefly discuss several questions about the mass sources of the flows, the covering factors, and the stability of the narrow absorption details. 
E.Y. Vilkoviskij, R.V.E. Lovelace, L.A. Pavlova, M.M. Romanova, S.N.   Yefinov