“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 J. of Informatics, vol. 2, no. 2, pp. 80–87, Sep. 2024, doi: 10.15294/fqc79v89.