Persistent Organic Pollutant Determination in Killer Whale Scat Samples: Optimization of a Gas Chromatography/Mass Spectrometry Method and Application to Field Samples, Wasser Samuel K, Lundin Jessica I, Dills RL, Ylitalo Gina M, Bradley Hanson M, Emmons Candice K, Schorr GS, Hempelmann Jennifer A, and Parson Kim M, Arch Environ Contam Toxicol , Volume DOI 10.1007/s00244-015-0218-8 (2015)