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The content of this paper is now available as part of arXiv:0902.1502
This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.
This paper has been withdrawn by the author because overcame by arXiv:0910.4694
This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.
This manuscript, a revised version of arXiv:0811.3168v1, was inadvertently submitted as a separate paper. It can now be accessed, including some final corrections for the published version, as arXiv:0811.3168v2.
The content of this preprint together with additional material appears now in 0706.2154.
This is no longer available.
This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2080.
This results in this paper have been merged with the result in arXiv:1003.0167. The authors would like to withdraw this version. Please see arXiv:1008.5356 for the merged version.
In addition, our work has text overlap with arXiv:1804.06242, arXiv:1705.00938 by other authors. We want to rewrite this paper for avoiding this fact.
The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968
This paper has been withdrawn since its content is included in the more general version arXiv:0804.1882
This paper is superseded by arXiv:1106.3363.
This document contains supplementary material for the article with the same title that appeared in American Journal of Physics in 2019
This paper is a revised version of a previously posted paper in arxiv. The authors posted it as a new submission by mistake. The latest version of the paper can be found at arXiv:math-ph/0512003v2
This is a resubmission of preprint 9401008 , which has some TeXnical errors introduced by the "reform" procedure (designed to avoid precisely these problems!). The original can be formatted by editing out the messages "%% following line…
This paper has been withdrawn because it has been by far superseded by the Author's post arXiv:1108.1306v6, which was published on 30/08/2011.
This paper has been withdrawn. (Reason) Its contents have been entirely superseded by the contents of the articles arXiv:0809.3444 and arXiv:0705.3070. There is no profitable reason to keep it alive. No material on it is however wrong.
This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.
An updated version of this paper (but with a different title) can be found at arXiv:1204.4262