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Schmidt, Annie E.; Ballard, Grant «Significant chick loss after early fast ice breakup at a high-latitude emperor penguin colony». Antarctic Science, 32, 3, 2020, pàg. 180–185. Bibcode: 2020AntSc..32..180S. DOI: 10.1017/S0954102020000048.
Lyver, P. O.; Barron, M.; Barton, K. J.; Ainley, D. G.; Pollard, A.; Gordon, S.; McNeill, S.; Ballard, G.; Wilson, P. R. «Trends in the Breeding Population of Adelie Penguins in the Ross Sea, 1981-2012: A Coincidence of Climate and Resource Extraction Effects». PLOS ONE, 9, 3, 2014, pàg. e91188. DOI: 10.1371/journal.pone.0091188. PMC: 3951313. PMID: 24621601.