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This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn by the author; its content is properly cantained in the paper arXiv:0706.4447, entitled "Pure motives, mixed motives and extensions of motives associated to singular surfaces", and submitted on June 29, 2007.

This paper has been withdrawn by the author, due to an error in the inequality after the inequality (31).

This paper has been withdrawn by the author(s), due an error in the proof.

This paper has been withdrawn by the author due to extremely unscientific errors.

This paper has been withdrawn by the author(s), due an error in the proof.

This article has been withdrawn due to an error in a proof of the main result.

This paper has been withdrawn by the author because there are some typos in proofs.

This paper has been withdrawn by the author(s)

This paper has been withdrawn by the author

This paper has been withdrawn by the author

This paper is removed from the network permanently. The content in this paper has now been put together with hep-th/9310183. See the recently replaced and widely revised version of the latter.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

The paper has been withdrawn by the author due to unhappy mistake in the initial scope of the work.

The paper is withdrawn.

withdrawn by the authors because of an error.

A technical flaw was found in this paper, and it has been withdrawn. It is intended that a modified version will be submitted soon.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn due to a photometric calibration error.

This paper has been withdrawn by the author.