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This paper is withdrawn.

Unfortunately, after an imprudent sumbission of the paper to the e-print archive, I discovered in it many serious mistakes. So I draw back it .

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2080.

This paper has been removed by arXiv administrators because of overlap with gr-qc/0303034. This paper also has excessive overlap with the following papers also written by the authors or their collaborators: gr-qc/0601133, gr-qc/0602012,…

This paper has been withdrawn because it is a duplicate of [math/0609208].

This paper has been withdrawn by the author, due to errors in Groebner basis calculations in the cases of five and six dimensional groups.

This paper has been withdrawn by the author due to a crucial definition error of Triebel space.

This paper has been withdrawn by the author due to its publication

This paper has been withdrawn by the authors due to crucial error in the main proof (located in Section 2.4). The authors apologize for any inconveniences.

This paper has been withdrawn by the authors because the authors excluded the paper from electronic proceedings of the conference.

This paper has been withdrawn due to a photometric calibration error.

This paper has been withdrawn by the author due to an error in an inequality in the proof of Theorem 1.1.

This paper has been withdrawn. The authors realized that the obtained results were not new.

This paper has been withdrawn by the author due to a mistake.

This paper has been removed by arXiv admin because it was an erroneous duplicate of astro-ph/9411031.

This paper has been withdrawn by the author, since the author does not have enough time to answer every questions on this result.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the authors due to numerical problems to get viable results.

The paper has been withdrawn due to a crucial error in section 3.

This paper has been withdrawn by the author due to an error.