Problem-based learning (PBL) strategy to strengthen cognitive skills in students of a National University - Chachapoyas. Journal SCIENCEVOLUTION, [S. l.], v. 4, n. 4, p. 19–29, 2022. DOI: 10.61325/ser.v4i4.26. Disponível em: https://www.revista.sciencevolution.com/index.php/sciencievolution/article/view/26. Acesso em: 6 jun. 2026.