© 2007 Christoph Adam, Joaquin Sanchez-Guillen and Andrzej Wereszczynski. This work was published in SIGMA under the terms of the Creative Commons Attribution-ShareAlike License
Except where otherwise noted, this item's license is described as  © 2007 Christoph Adam, Joaquin Sanchez-Guillen and Andrzej Wereszczynski. This work was published in SIGMA under the terms of the Creative Commons Attribution-ShareAlike License





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