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This paper has been withdrawn by the author due to a crucial error.
This paper has been withdrawn by the author because it has been substantially modified.
This paper has been withdrawn by the author.
This paper has been withdrawn
This paper has been withdrawn by the author, due to an error in relation (11).
This paper has been withdrawn by the author. Proofs of two propositions need more details.
This paper is withdrawn.
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This paper has been retracted, for obvious reasons.
This paper has been withdrawn by the authors.
This paper had been withdrawed
The paper has been withdrawn by the author.
This paper has been withdrawn by the author due to the unsure solution to the Dyson-Schwinger equation.
The paper has been withdrawn by authors.
This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.
This paper has been withdrawn while the author verifies the literature.
This paper has been withdrawn.
This paper has been withdrawn by authors for significant modification.
This paper has been withdrawn by the author, since some results of the paper have been already obtained in [J.~Lewandowski, Class. Quantum Grav. 9 (1992), no. 10, L147--L151.]
This paper has been withdrawn by the author.