Related papers: A classification of S^3-bundles over S^4
This paper has been withdrawn by the author due to a serious gap in the proof of the main theorem.
This paper has been withdrawn by the author due to the presented idea is wrong.
This paper has been withdrawn due to fundamental errors.
This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.
This paper has been withdrawn by the authors due to essential errors in Theorem 5.6.
This paper has been withdrawn by the author, due to possible counter-examples.
This paper is withdrawn due to a mistake. The revised version with a new tiltle can be found in hep-ph/0502199.
Major mistake. The paper has been withdrawn.
This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.
This paper has been withdrawn due a crucial mistake due to a crucial mistake in the proof of Lemma 2.3.
This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.
This paper has being withdrawn by the authors due to an error in the conclusion.
We withdraw this paper due to insufficient arguments in the derivation of Theorem 1. See quant-ph/0005062 for the new paper
This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.
The paper has been withdrawn.
This paper has been withdrawn by the authors due to a crucial gap in the estimates for m>=4.
This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.
This paper has been withdrawn by the author due to errors and bad formalization.
This paper has been withdrawn by the author due to a critical error in the proof of Theorem A pointed out by Burkhard Wilking.
This paper has been withdrawn by the author due to an error estimate in Lemma 3.1.