@article{oliveira_campedelli_bergamo_santos_casagrande_2010,  title={Substituted tridentate pyrazolyl ligands for chromium and nickel-catalyzed ethylene oligomerization reactions: effect of auxiliary ligand on activity and selectivity},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010000700019},  DOI={10.1590/S0103-50532010000700019},  number={7},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Oliveira, Lucilene L. de and Campedelli, Roberta R. and Bergamo, Adão L. and Santos, Ana H. D. P dos and Casagrande, Osvaldo L.},  year={2010},  pages={1318–1328} }