Related papers: Unified Expressions Of All Differential Variationa…

This paper has been withdrawn by the author(s), due the final version in math.QA/0604564

This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader. I am currently revising the manuscript.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

The paper has been withdrawn by authors. The issues studied in this paper were changed so much that we have published a new paper considering these issues. See hep-th/0406074

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

Manuscript withdrawn by the authors.

This paper has been withdrawn

This paper has been withdrawn by the author due a few mistakes in the paper.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial sign error in Proposition 3.1.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn since we combine this paper with math.AC/0503685. All contents of the paper have been moved to math.AC/0503685.

The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn.