TY - JOUR A1 - Ochsenkühn-Petropoulou, M. A1 - Lampropoulou, A. A1 - Becker, H. A1 - Spyra, Wolfgang T1 - Polycyclic Armoatic Hydrocarbons in Wooden Railway Beams Impregnated with Coal Tar: Extraction and Quantification by GC-MS KW - railway sleepers KW - tar KW - pah KW - impregnation Y1 - 2001 ER -