Exact Solutions of the Photon Equation in Anisotropic Spacetimes
  This paper has inappropriate amounts of overlap with the following papers also written by the authors or their collaborators: gr-qc/0506135, gr-qc/0207026, gr-qc/0502059, gr-qc/0502061, gr-qc/0510037, and others. 
Ali Havare, Murat Korunur, Oktay Aydogdu, Mustafa Salti and Taylan   Yetkin