Robert T. Barrett, Robert W. Furness, The Prey and Diving Depths of Seabirds on Hornøy, North Norway after a Decrease in the Barents Sea Capelin Stocks, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 21, No. 3 (Sep., 1990), pp. 179-186
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Barrett et al. (1990) studied this question.
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