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| Document | Date | Modification of previous version | ||
| version | ||||
| 1.0 | April 28, 2005 | Initial document | ||
| 1.1 | May 19, 2005 | Minor modifications in response | ||
to comments by RWS  RIKZ |
||||
| 1.2 | January 10, 2006 | Translation into English | ||
| 1.3 | March 22, 2006 | Some minor modifications and | ||
| extensions |