@misc{ahrens_polyflouroalkyl_compounds_2009, 
author={Ahrens, L.},
title={Polyflouroalkyl Compounds in the Marine Environment - Investigations on their Distribution in Surface Water and Temporal Trends in Harbor Seals (Phoca vitulina) (Dissertation)},
year={2009},
howpublished = {doctoral thesis,GKSS report},
note = {Online available at: \url{} (DOI). Ahrens, L.: Polyflouroalkyl Compounds in the Marine Environment - Investigations on their Distribution in Surface Water and Temporal Trends in Harbor Seals (Phoca vitulina) (Dissertation). Leuphana Universitaet Lueneburg, FB Umwelt und Technik, 2009.}}