Related papers: Concept of a Value in Multilevel Security Database…

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, due an error in claim 1.

This paper has been withdrawn.

None. This paper has been withdrawn by the authors.

This paper has been withdrawn by author.

This article has been withdrawn.

This paper was withdrawn by the authors.

This paper has been withdrawn.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors. A substantially altered paper will be submitted incorporating major corrections, additions and improvements.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn

This paper was withdrawn by the author.

This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author

This paper has been withdrawn. The results are now part of math.GR/9804072.

The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

This paper has been withdrawn by the authors pending corrections.