GFPGAN UPSCALING FOR HUMAN FACIAL EXPRESSION CLASSIFICATION USING VGG19 ARCHITECTURE. jitk [Internet]. 15 Agustus 2025 [dikutip 11 Februari 2026];11(1):18-26. Tersedia pada: https://ejournal.nusamandiri.ac.id/index.php/jitk/article/view/6558