M. E. Purbaya, D. P. Rakhmadani, Maliana Puspa Arum, and Luthfi Zian Nasifah, “Implementation of n-gram Methodology to Analyze Sentiment Reviews for Indonesian Chips Purchases in Shopee E-Marketplace”, J. RESTI (Rekayasa Sist. Teknol. Inf.) , vol. 7, no. 3, pp. 609 - 617, Jun. 2023.