K. A. do N. Maieski, B. Schulze, and M. J. Cremer, “Duration of scratches in Guiana dolphin, Sotalia guianensis (Cetartiodactyla: Delphinidae): Supplementary marks to improve abundance estimates”, Lat. Am. J. Aquat. Mamm., vol. 15, no. 1, pp. 3-7, Aug. 2020.