Saputra, Jeffri Prayitno Bangkit, and Aayush Kumar. “Emotion Detection in Railway Complaints Using Deep Learning and Transformer Models: A Data Mining Approach to Analyzing Public Sentiment on Twitter”. Journal of Digital Society, vol. 1, no. 2, Apr. 2026, pp. 109-22, https://jds.mbicore.com/index.php/jds/article/view/20.