M. N. A. de Sousa, C. Silva Oliveira, M. W. M. Formiga, and N. C. S. Araújo, “Frequency of sleep disorders in rural workers”, Braz. J. Prod. Eng., vol. 7, no. 1, pp. 31–40, Feb. 2021, doi: 10.47456/bjpe.v7i1.33491.