Latifah, N. et al. 2026. Time-Series Monitoring of Sentiment Dynamics in Reviews of Four Indonesian E-Wallet Applications Using a Hybrid TF-IDF and Bi-LSTM Framework. Journal of Information Systems and Informatics. 8, 2 (Apr. 2026), 1958–1983. DOI:https://doi.org/10.63158/journalisi.v8i2.1488.