L. Ciotti, и J. Ostriker. (2011)cite arxiv:1104.2238
Comment: 20 pages, 4 (low-resolution) figures. Abbreviated version of the
article to appear in book "Hot Interstellar Matter in Elliptical Galaxies",
D.-W. Kim and S. Pellegrini eds., Astrophysics and Space Science Library
(ASSL), Springer.