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Stewardson (1999), p. 221. Stewardson, C. L. (1999). "The Impact of the Fur Seal Industry on the Distribution and Abundance of Cape Fur Seals Arctocephalus Pusillus Pusillus on the Eastern Cape Coast of South Africa". Transactions of the Royal Society of South Africa. 54 (2): 217–245. Bibcode:1999TRSSA..54..217S. doi:10.1080/00359199909520626.