NUGRAHA, D. A.; WIGUNA, A. S. Seleksi Fitur Warna Citra Digital Biji Kopi Menggunakan Metode Principal Component Analysis. RESEARCH : Journal of Computer, Information System & Technology Management, [S. l.], v. 3, n. 1, p. 24–30, 2020. DOI: 10.25273/research.v3i1.5352. Disponível em: https://e-journal.unipma.ac.id/index.php/RESEARCH/article/view/5352. Acesso em: 13 mar. 2025.