Scheidat , M. ., K.-H. . Kock, and U. . Siebert. “Summer Distribution of Harbour Porpoise (Phocoena Phocoena) in the German North Sea and Baltic Sea”. J. Cetacean Res. Manage., vol. 6, no. 3, Mar. 2023, pp. 251-7, doi:10.47536/jcrm.v6i3.767.