S. Samidi, R. Y. . Suladi, and D. Kusumaningsih, “Comparison of the RFM Model’s Actual Value and Score Value for Clustering”, J. RESTI (Rekayasa Sist. Teknol. Inf.) , vol. 7, no. 6, pp. 1430–1438, Dec. 2023, doi: 10.29207/resti.v7i6.5416.