TY - JOUR A1 - T. Johannsen A1 - D. Psaltis AU - BT - ApJ IS - 1 LA - eng PY - 2010 EP - 187 T1 - Testing the No-hair Theorem with Observations in the Electromagnetic Spectrum. I. Properties of a Quasi-Kerr Spacetime T2 - ApJ TI - Testing the No-hair Theorem with Observations in the Electromagnetic Spectrum. I. Properties of a Quasi-Kerr Spacetime VL - 716 Y1 - 2010 ER -