TY - CONF A1 - Becker, Roland T1 - External quality control: a way to improve reliability in hair analysis T2 - 18th Meeting of the Society of Hair Testing T2 - 18th Meeting of the Society of Hair Testing CY - Geneva, Switzerland DA - 2013-08-28 PY - 2013 AN - OPUS4-28723 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -