SIALLAGAN, Ella Widya; AHDA, Annisa; BANGUN, Aprilia Egydita Br; TINDAON, Santa Gabriela Grey; MANIK, Nina Aloisa. Smartphone Use and Students’ Concentration in Class: A Qualitative Study at SMP Negeri 27 Medan. Outline Journal of Education, [S. l.], v. 6, n. 1, p. 48–55, 2026. DOI: 10.61730/7eddkm92. Disponível em: https://journal.outlinepublisher.com/index.php/OJE/article/view/760. Acesso em: 7 nov. 2026.