Lockyer, Christina. “A Review of Methods for Defining Population Structure in the Harbour Porpoise (<i>Phocoena phocoena</I>)”. NAMMCO Scientific Publications 50 (July 1, 2003): 41-69. Accessed November 26, 2020. https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2739.