One-Loop Electroweak Corrections to the Muon Anomalous Magnetic Moment   Using the Pinch Technique
  The definition of the physical properties of particles in perturbative gauge theories must satisfy gauge invariance as a requisite. The Pinch Technique provides a framework to define the electromagnetic form factors and the electromagnetic static properties of fundamental particles in a consistent and gauge-invariant form. We apply a simple prescription derived in this formalism to check the calculation of the gauge-invariant one-loop bosonic electroweak corrections to the muon anomalous magnetic moment. 
L. G. Cabral-Rosetti, G. L\'opez Castro and J.Pestieau