FAISAL, F. Recommendation Model for Learning Materials Using Graph Neural Networks Based on Conceptual Relationships and Difficulty Level of the Materials. RIGGS: Journal of Artificial Intelligence and Digital Business, [S. l.], v. 4, n. 3, p. 8313–8320, 2025. DOI: 10.31004/riggs.v4i3.3247. Disponível em: https://journal.ilmudata.co.id/index.php/RIGGS/article/view/3247. Acesso em: 1 feb. 2026.