Annular gap model for multi-wavelength pulsed emission from young and   millisecond pulsars
  The multi-wavelength pulsed emission from young pulsars and millisecond pulsars can be well modeled with the single-pole 3-dimension annular gap and core gap model. To distinguish our single magnetic pole model from two-pole models (e.g. outer gap model and two-pole caustic model), the convincing values of the magnetic inclination angle and the viewing angle will play a key role. 
YuanJie Du, GuoJun Qiao
astro-ph.HE