Dr Ulrich Witzel

• Address 1: Institute of Construction Technique,
  Ruhr-University Bochum,
  D-44780 Bochum,
  Germany.
  tel:+49-234 7094159
  fax: +49-234 7004058
  

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• Address 2:
• Email: Ulrich.Witzel@ruhr-uni-bochum.de