  This paper has excessive overlap with the following papers also written by
the authors or their collaborators: gr-qc/0607103, gr-qc/0607119,
gr-qc/0607115, gr-qc/0607102, gr-qc/0602012, gr-qc/0702047, gr-qc/0607089,
gr-qc/0510123, and others.
