@article{Gabrielatos_Sarmento_2006, title={Central Modals in an Aviation Corpus: Frequency and Distribution}, volume={41}, url={https://revistaseletronicas.pucrs.br/ojs/index.php/fale/article/view/600}, number={2}, journal={Letras de Hoje}, author={Gabrielatos, Costas and Sarmento, Simone}, year={2006}, month={set.} }