Related papers: Black Holes and Open Strings

This paper has been withdrawn.

This paper has been withdrawn by the author due to an error in the computation of the central charge.

This paper has been withdrawn by the author due to a crucial error

The paper has been withdrawn

This paper has been withdrawn by the authors due to numerical problems to get viable results.

This paper has been withdrawn.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author.

The paper has been withdrawn.

This paper has been withdrawn

The paper is taken out.

This paper has been withdrawn by the author.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This paper has been withdrawn by the authors.

This paper was withdrawn by the authors.

This paper has been withdrawn because of serious errors.

This paper has been withdrawn by the author(s)

This paper has been withdrawn.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2073.

A modified version of this paper is under process and with a new title and abstract. Hence, this version of the article is completely withdrawn.

The paper has been withdrawn by the author due to unhappy mistake in the initial scope of the work.