TY - CONF A1 - Nehls, Irene T1 - Reference materials for organic environmental analysis T2 - BERM-7 T2 - BERM-7 CY - Antwerp, Belgium DA - 1997-04-21 PY - 1997 AN - OPUS4-5671 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -