Related papers: Estimating the State of AC Power Systems using Sem…

This paper has been withdrawn by the author because it has been substantially modified.

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This paper has been withdrawn by the authors.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This paper has been withdrawn by the authors. I will do the major revision.

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This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

Due to a computational mistake this paper has been withdrawn.

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This paper has been withdrawn by the author due to new results to be added.

This paper was withdrawn by the author because the results already appeared in PRB 20, 4756 (1979).

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