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John C. George, Jeffrey Bada, Judith Zeh, Laura Scott, Stephen E. Brown, Todd O'Hara, Robert Suydam: Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization. Canadian Journal of Zoology, 1999, 77. vsk, nro 4, s. 571–580. doi:10.1139/cjz-77-4-571ISSN 1480-3283Artikkelin verkkoversio.
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John C. George, Jeffrey Bada, Judith Zeh, Laura Scott, Stephen E. Brown, Todd O'Hara, Robert Suydam: Age and growth estimates of bowhead whales (Balaena mysticetus) via aspartic acid racemization. Canadian Journal of Zoology, 1999, 77. vsk, nro 4, s. 571–580. doi:10.1139/cjz-77-4-571ISSN 1480-3283Artikkelin verkkoversio.