@article{arouxét_echebest_pilotta_2011,  title={Active-set strategy in Powell's method for optimization without derivatives},  volume={30},  ISSN={1807-0302},  url={https://doi.org/10.1590/S1807-03022011000100009},  DOI={10.1590/S1807-03022011000100009},  number={1},  journal={Computational & Applied Mathematics},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={Arouxét, Ma. Belén and Echebest, Nélida and Pilotta, Elvio A.},  year={2011},  pages={171–196} }