Williams H, Robins CW, Newman AEM, ?. The buzz segment of Savannah sparrow song is a population marker. Journal of Ornithology. 2018. Available at: http://link.springer.com/10.1007/s10336-018-1611-7.

Konrad CM, Frasier TR, Rendell L, Whitehead H, Gero S. Kinship and association do not explain vocal repertoire variation among individual sperm whales or social units. Animal Behaviour. 2018;145:131 - 140. Available at: https://linkinghub.elsevier.com/retrieve/pii/S0003347218302811https://api.elsevier.com/content/article/PII:S0003347218302811?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0003347218302811?httpAccept=text/plain.