Related papers: C K-edge in polymerized C$_{60}$ : experiment and …

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The paper was withdrawn by the author. Further research is needed.

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This paper has been temporarily withdrawn, due to an error in Eq. (3).

This paper has been withdrawn by the author due to a serious gap in the proof of the main theorem.

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This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

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This paper has been withdrawn by the author.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This paper has been withdrawn by the author