@article{1309757,
  author = {T. Johannsen and D. Psaltis},
  title = {Testing the No-hair Theorem with Observations in the Electromagnetic Spectrum. I. Properties of a Quasi-Kerr Spacetime},
  year = {2010},
  journal = {ApJ},
  volume = {716},
  pages = {187},
  language = {eng},
}