@article{bortolotto_danilewicz_andriolo_zerbini_2016,  title={Humpback whale <i>Megaptera novaeangliae</i> (Cetartiodactyla: Balaenopteridae) group sizes in line transect ship surveys: An evaluation of observer errors},  volume={33},  ISSN={1984-4670},  url={https://doi.org/10.1590/S1984-4689zool-20150133},  DOI={10.1590/S1984-4689zool-20150133},  number={2},  journal={Zoologia (Curitiba)},  publisher={Sociedade Brasileira de Zoologia},  author={Bortolotto, Guilherme A. and Danilewicz, Daniel and Andriolo, Artur and Zerbini, Alexandre N.},  year={2016},  pages={e20150133} }