@article{gomes_2012,  title={Attentiveness cycles: synchronized behavior and aggregate fluctuations},  volume={66},  ISSN={0034-7140},  url={https://doi.org/10.1590/S0034-71402012000300001},  DOI={10.1590/S0034-71402012000300001},  number={3},  journal={Revista Brasileira de Economia},  publisher={Fundação Getúlio Vargas},  author={Gomes, Orlando},  year={2012},  month={Jul},  pages={271–288} }