@article{engels_1987,  title={Pheromones and reproduction in brazilian stingless bees},  volume={82},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02761987000700009},  DOI={10.1590/S0074-02761987000700009},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={Engels, Wolf},  year={1987},  pages={35–45} }