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Submitted on: 01 February 1999.
Revised on: 28 February 1999.
Accepted on: 18 March 1999.
___________________Bauingenieur---VDI FACHMEDIEN GMBH & CO KG UNTERNEHMEN FACHINFORMATIONEN
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Submitted on: 01 January 2002.
Revised on: 29 January 2002.
Accepted on: 12 March 2002.
___________________Bauingenieur---VDI FACHMEDIEN GMBH & CO KG UNTERNEHMEN FACHINFORMATIONEN