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  2. https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2656.14065
  3. https://helcom.fi/baltic-sea-trends/maritime/accidents/
  4. https://ocean.si.edu/ocean-life/marine-mammals/seals-sea-lions-and-walruses
  5. https://www.annualreviews.org/content/journals/10.1146/annurev-earth-082517-010009
  6. https://www.annualreviews.org/content/journals/10.1146/annurev-earth-082517-010009