TY - CONF A1 - Wiggenhauser, Herbert A1 - Algernon, Daniel A1 - Abraham, O. T1 - Scanning impact-echo for the investigation of tendon ducts in concrete T2 - Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures T2 - Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures CY - Kielce, Poland DA - 2005-09-18 PY - 2005 AN - OPUS4-10986 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -