Related papers: Gieseker-Petri special curves

This paper has been withdrawn by the author due to errors and bad formalization.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, since it is now a part of "Classical aspects of lightlike dimensional reduction" Class.Quant.Grav.23:7085-7110, 2006, gr-qc/0610011

This paper has been withdrawn by the author, due to a crucial error in the proof of Lemma 3.1.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

This paper is withdrawn.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the author due to a crucial error in one of equation in (3).

This paper has been withdrawn by the authors, due a oversimplified decoherence model.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This paper has been withdrawn by the authors pending corrections.

This paper has been withdrawn by the author

The paper has been withdrawn

This paper has been withdrawn by the author.

This paper has been withdrawn

This paper has been withdrawn by the author due to a crucial error.

The paper has been withdrawn

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author due to a crucial error related with the consideration of regular points

This paper has been withdrawn by the authors, because of serious experimental problems.