Related papers: Black Holes and Open Strings

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This paper has been withdrawn, as it has been merged into arXiv:1009.6144

This paper has been temporarily withdrawn for corrections.

The paper is withdrawn by the author due to an oversimplified and misleading approach which was taken initially as a starting point.

This paper has been withdrawn since the results are not satisfied.

The paper was retracted.

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This paper has been withdrawn by the author. It will be replaced, substantially modified, by sections of the author's completed PhD thesis.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn by the author.

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This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the authors because it had major revisions.

This paper has been withdrawn temporarily.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to new experimental results.