@article{guerra_1999,  title={Hematoxylin: a simple, multiple-use dye for chromosome analysis},  volume={22},  ISSN={1415-4757},  url={https://doi.org/10.1590/S1415-47571999000100016},  DOI={10.1590/S1415-47571999000100016},  number={1},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Guerra, Marcelo},  year={1999},  month={Mar},  pages={77–80} }