Related papers: String amplitudes and the Penrose limit

This paper has been withdrawn by the author due to a crucial sign error.

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This paper has been withdrawn by the author due to a crucial error in equation.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper is withdrawn because of an error in Lemma 3.1

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Withdrawn due to error. See D. Lowe, L. Susskind and J. Uglum, hep-th/9402136, for correct treatment. Apologies to all recipients.

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The paper was withdrawn by the authors

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This paper has been withdrawn by the authors. Because of a misunderstanding, the paper was submitted prematurely to the arXiv. A replacement will follow.

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This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author, due to errors in the figures.

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This paper has been withdrawn by the authors due to a fatal flaw in the central proof.

This paper has been withdrawn because the issues raised have been resolved by Cabibbo and Isidori, hep-ph/0502130.