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28 Juni 2004 - PEF 0.3.0 released (documentation not updated).
18 May 2004 - PEF 0.2.1 released
18 May 2004 - PEF 0.2.0 released and removed due to severe errors.
2 July 2003 - PEF 0.1.0 released
1 July 2003 - PEF 0.0.9 released