@article{sant ana filho_rossete_tavares_prestes_bendassolli_2012,  title={Synthesis of 15N-enriched urea (CO(15NH2)2) from 15NH3, CO, and S in a discontinuous process},  volume={29},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322012000400011},  DOI={10.1590/S0104-66322012000400011},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Sant Ana Filho, C. R. and Rossete, A. L. R. M. and Tavares, C. R. O. and Prestes, C. V. and Bendassolli, J. A.},  year={2012},  month={Oct},  pages={795–806} }