Mohamad Fahmi Hafidz and Sri Lestari, “Solution to Scalability and Sparsity Problems in Collaborative Filtering using K-Means Clustering and Weight Point Rank (WP-Rank)”, J. RESTI (Rekayasa Sist. Teknol. Inf.) , vol. 7, no. 4, pp. 743 - 750, Aug. 2023.