@article{costa_castelar_2024,  title={Estimating structural and frictional unemployment: An application of empirical mode decomposition},  volume={78},  ISSN={0034-7140},  url={https://doi.org/10.5935/0034-7140.20240005},  DOI={10.5935/0034-7140.20240005},  journal={Revista Brasileira de Economia},  publisher={Fundação Getúlio Vargas},  author={Costa, Rodolfo Ferreira Ribeiro da and Castelar, Luiz Ivan de Melo},  year={2024},  pages={e052024} }