Giorli G, Goetz KT. Acoustically estimated size distribution of sperm whales ( Physeter macrocephalus) off the east coast of New Zealand.  2019. Available at: https://www.tandfonline.com/doi/full/10.1080/00288330.2019.1679843https://www.tandfonline.com/doi/pdf/10.1080/00288330.2019.1679843.