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This paper has been withdrawn by the author due to a crucial mistakes.

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Comment withdrawn. To be superseded by a subseqent paper.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

This submission has been withdrawn by arXiv administrators because it is a duplicate of astro-ph/0701570.

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This paper has been withdrawn by the author due to similarity to the author's other paper

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This paper has been superseded by math.AG/0510287 and withdrawn by the author.

The paper has been withdrawn by change of content and some errors in the examples.

This submission to arXiv has been withdrawn by the authors

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This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn. (Reason) Its contents have been entirely superseded by the contents of the articles arXiv:0809.3444 and arXiv:0705.3070. There is no profitable reason to keep it alive. No material on it is however wrong.

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The paper was withdrawn by the authors

This paper has been withdrawn by the authors due to an unlikely results.