“Analysis Of The Use Of Nazief-Adriani Stemming And Porter Stemming In Covid-19 Twitter Sentiment Analysis With Term Frequency-Inverse Document Frequency Weighting Based On K-Nearest Neighbor Algorithm”. Recursive Journal of Informatics 2, no. 2 (September 30, 2024): 80–87. Accessed December 5, 2025. https://journal.unnes.ac.id/journals/rji/article/view/34868.