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This paper has been withdrawn. See quant-ph/0408115: G. M. D'Ariano, P. Perinotti and P. Lo Presti, "Classical randomness in quantum measurements"

This paper has been withdrawn by the author due to the appearence of enlarged version with one new author name more (hep-ph/0012293).

This paper has been withdrawn by the authors because it had major revisions.

The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

The paper has been withdrawn by the author.

This paper has been withdrawn, as it has been merged into arXiv:1009.6144

This paper was withdrawn by the author because severe errors were discovered.

The paper has been withdrawn.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author due to some problems.

The article is taken out.

This paper has been withdrawn by the author due to serious error found in main argument.

This article has been replaced by arXiv:0807.3093

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper is being withdrawn.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author

This paper is withdrawn.

This paper is withdrawn. The revised paper appears in chao-dyn/9904020