Exploring Student Learning Concentration Through Whatsapp Group: A Classroom Teacher’s Effort in Online Learning During The Pandemic. Online Learning In Educational Research (OLER), [S. l.], v. 2, n. 1, p. 1–10, 2022. DOI: 10.58524/oler.v2i1.85. Disponível em: https://journal.foundae.com/index.php/oler/article/view/85. Acesso em: 16 jan. 2026.