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This paper has been withdrawn by the author, due a crucial error in the main idea.
This paper has been withdrawn by the authors because the results obtained have been reported earlier by other authors.
This paper has been withdrawn by the author due to a crucial mistakes.
This paper has been withdrawn by the authors
This paper has been withdrawn by the author due to a crucial problem in Lemma 3. This equation must be changed.
This paper has been withdrawn.
This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.
This paper has been withdrawn by the author due to a crucial error in the submission action.
This paper has been withdrawn.
This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.
This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.
This paper has been withdrawn by the author
This paper has been withdrawn by the author.
The paper has been withdrawn because the research work is still in progress.
This article has been withdrawn by the authors
This paper has been withdrawn by the author because it needs a deep methodological revision.
This paper has been withdrawn by the author.
This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.
This paper was withdrawn by the author.
This paper has been withdrawn by the author, since now all four parts of the review are available as a single file 0804.1639. I also made some revision of the text in order to avoid misprints and some inaccurate expressions.