The Dynamics of Photon in the Shuwer: A Class of Solutions
  This paper has excessive overlap with the following papers also written by the authors or their collaborators: gr-qc/0502059, gr-qc/0502061, gr-qc/0510037, gr-qc/0510038, gr-qc/0207026, and others. 
M. Salti, O. Aydogdu, A. Havare, M. Korunur