@article{casagrande_gil_casagrande jr._2005,  title={Titanium and vanadium ethylene polymerization catalysts containing tris(pyrazolyl)borate ligand: Effects of polymerization parameters on activity and polymer properties},  volume={16},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532005000700029},  DOI={10.1590/S0103-50532005000700029},  number={6a},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Casagrande, Adriana C. A. and Gil, Marcelo P. and Casagrande Jr., Osvaldo L.},  year={2005},  month={Nov},  pages={1283–1289} }