@article{milhomem_dantas_2020,  title={Analysis of new approaches used in portfolio optimization: a systematic literature review},  volume={30},  ISSN={0103-6513},  url={https://doi.org/10.1590/0103-6513.20190144},  DOI={10.1590/0103-6513.20190144},  journal={Production},  publisher={Associação Brasileira de Engenharia de Produção},  author={Milhomem, Danilo Alcantara and Dantas, Maria José Pereira},  year={2020},  pages={e20190144} }