@article{britto_mello_1999,  title={Morphological dimorphism in the Y chromosome of "pé-duro" cattle in the Brazilian State of Piauí},  volume={22},  ISSN={1415-4757},  url={https://doi.org/10.1590/S1415-47571999000300014},  DOI={10.1590/S1415-47571999000300014},  number={3},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Britto, Carmen M.C. and Mello, Maria Luiza S.},  year={1999},  month={Sep},  pages={369–373} }