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^Ryan S. Paterson; Natalia Rybczynski; Naoki Kohno; Hillary C. Maddin (2020). „A total evidence phylogenetic analysis of pinniped phylogeny and the possibility of parallel evolution within a monophyletic framework”. Frontiers in Ecology and Evolution. 7: Article 457. doi:10.3389/fevo.2019.00457.
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