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jstor.org
Rogers, Tracey L. and Cato, Douglas H. (2002). "Individual Variation in the Acoustic Behaviour of the Adult Male Leopard Seal, Hydrurga leptonyx". Behaviour. 139 (10): 1267–1286. doi:10.1163/156853902321104154. JSTOR4535987.{{cite journal}}: CS1 maint: multiple names: authors list (ลิงก์)
