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This paper has been withdrawn by the author due to an error in the derivation.

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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the authors due to a crucial error.

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This paper has been withdrawn by the author ali pourmohammad.

This paper is withdrawn. See quant-ph/9806031 for a discussion.

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This paper has been withdrawn by the author(s). Please refer to quant-ph/0311171.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn for the reasons mentioned in the Comments.

This paper has been temporarily withdrawn by the authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn temporarily.