L. Santillán, M. Roca, M. Apaza, L. R. Oliveira, and K. Ontón, “ New record of mother-calf pair of southern right whale, <i>Eubalaena australis</i>, off the Peruvian coast”, Lat. Am. J. Aquat. Mamm., vol. 3, no. 1, pp. 83-84, Jun. 2004.