@article{bonacin_engelmann_severino_toma_baptista_2009,  title={Singlet oxygen quantum yields (Φd) in water using beetroot extract and an array of LEDs},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000100006},  DOI={10.1590/S0103-50532009000100006},  number={1},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Bonacin, Juliano A. and Engelmann, Fábio M. and Severino, Divinomar and Toma, Henrique E. and Baptista, Mauricio S.},  year={2009},  pages={31–36} }