Test of Gauge Covariance of Fermion-Photon Vertex in Quenched, Massless   Three Dimensional Quantum Electrodynamics
  We study the gauge covariance of the fermion-photon vertex in quenched, massless 3-dimensional quantum electrodynamics. A class of vertex Ans\"{a}tze obtained by generalizing that proposed by Dong et al. is tested using the invariance of the photon polarization scalar under the Landau-Khalatnikov transformation. 
Paulus C. Tjiang, Conrad J. Burden