Nielsen, Nynne H, Gísli A. Víkingsson, Steen H. Hansen, Susanne Ditlevsen, and Mads Peter Heide-Jørgensen. 2017. “Two techniques of age estimation in cetaceans: GLGs in teeth and earplugs, and measuring the AAR rate in eye lens nucleus”. NAMMCO Scientific Publications 10 (August). https://doi.org/10.7557/3.4184.