Related papers: Imitative Trust versus Indirect Reciprocity

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This paper has been withdrawn by the author: it was a too preliminary version.

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This paper has been withdrawn by the author(s).The scheme presented is insecure.

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This paper has been withdrawn by the authors.

The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

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This paper has been withdrawn by the authors, since the reference citation were not appropriately arranged.

This submission has been withdrawn at the request of the author.

The paper has been temporarily withdrawn.

This paper has been withdrawn by the author.

The paper has been withdrawn

The paper has been withdrawn by the authors. The contents of the paper will be used in a future communication which will contain major addition and shift of focus.

This paper has been withdrawn by the authors; the main conclusion is incorrect, as some of the crucial calculations were not properly converged.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to the fact that the conjecture has indeed already long been established.

This paper has been withdrawn by the authors due to an error.

This paper has been withdrawn by the author.