Calambokidis, J., Barlow, J., Ford, J. K. B., Chandler, T. E., & Douglas, A. B.. (2009).
Insights into the population structure of blue whales in the Eastern North Pacific from recent sightings and photographic identification.
Marine Mammal Science,
25(4), 816 - 832. doi:10.1111/j.1748-7692.2009.00298.x