H. A. L. Souza et al., “Sentiment analysis of user-generated content in metro service evaluation: a comparative longitudinal study of Sé (São Paulo) and Central do Brasil (Rio de Janeiro) Stations”, Braz. J. Prod. Eng., vol. 11, no. 4, pp. 341–358, Dec. 2025, doi: 10.47456/bjpe.v11i4.51173.