@article{ferreira_abdalla_kerr_cruz-landim_2004,  title={Comparative anatomy of the male reproductive internal organs of 51 species of bees},  volume={33},  ISSN={1519-566X},  url={https://doi.org/10.1590/S1519-566X2004000500005},  DOI={10.1590/S1519-566X2004000500005},  number={5},  journal={Neotropical Entomology},  publisher={Sociedade Entomológica do Brasil},  author={Ferreira, Amilton and Abdalla, Fábio C. and Kerr, Warwick E. and Cruz-Landim, Carminda da},  year={2004},  month={Sep},  pages={569–576} }