@article{nahum_pereira_campos fernandes_russo matioli_wajntal_2003,  title={Diversification of Ramphastinae (Aves, Ramphastidae) prior to the Cretaceous/Tertiary boundary as shown by molecular clock of mtDNA sequences},  volume={26},  ISSN={1415-4757},  url={https://doi.org/10.1590/S1415-47572003000400003},  DOI={10.1590/S1415-47572003000400003},  number={4},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Nahum, Laila Alves and Pereira, Sérgio Luiz and Campos Fernandes, Flora Maria de and Russo Matioli, Sergio and Wajntal, Anita},  year={2003},  month={Dec},  pages={411–418} }