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FURNESS, B.L. & LAUGKSCH, R.C. (1983). An attempt to use barium meals and X-ray photography to determine the gastric evacuation rate and gut retention time in Jackass Penguins Spheniscus demersus
Marine Ornithology 11(-1),
3-6
http://doi.org/10.5038/2074-1235.11.-1.106
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