@article{neves_gitirana_serrão_2003,  title={Ultrastructure of the midgut endocrine cells in Melipona quadrifasciata anthidioides (Hymenoptera, Apidae)},  volume={63},  ISSN={1519-6984},  url={https://doi.org/10.1590/S1519-69842003000400015},  DOI={10.1590/S1519-69842003000400015},  number={4},  journal={Brazilian Journal of Biology},  publisher={Instituto Internacional de Ecologia},  author={Neves, C. A. and Gitirana, L. B. and Serrão, J. E.},  year={2003},  month={Nov},  pages={683–690} }