%0 conference poster %@ %A Ahrens, L., Xie, Z., Siebert, U., Ebinghaus, R. %D 2008 %J 5th International Symposium on Persistent Toxic Substances %T Temporal and Spatial Trends of Polyfluorinated Compounds in Common Seals (Phoca vitulina) from the North and Baltic Sea %U %X