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3 Khalaf-von Jaffa, Norman Ali (2004). Der Schweinswal (Phocoena phocoena) in der Nord- und Ostsee...The Harbour Porpoise (Phocoena phocoena) in the North Sea and Baltic Sea. Gazelle: The Palestinian Biological Bulletin. Bonn-Bad Godesberg, Federal Republic of Germany. Number 36, Twenty-second Year, October 2004. pp. 1-7. Khalaf-v