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Pennycuick, C. J. (1982). "The flight of petrels and albatrosses (Procellariiformes), observed in South Georgia and its vicinity". Philosophical Transactions of the Royal Society of London B. 300 (1098): 75–106. Bibcode:1982RSPTB.300...75P. doi:10.1098/rstb.1982.0158.