The Astrophysical Signatures of Black Holes: The Horizon, The ISCO, The Ergosphere and The Light Circle

Abramowicz, M. A. (2014). The Astrophysical Signatures of Black Holes: The Horizon, The ISCO, The Ergosphere and The Light Circle. In General Relativity, Cosmology and Astrophysics (pp. 501–522). Springer International Publishing. https://doi.org/10.1007/978-3-319-06349-2_24