LUZAN, Petro. Activation of learning and cognitive activity for future skilled workers by means of problem training. Professional Pedagogics, Kyiv, n. 3, p. 19–26, 2012. DOI: 10.32835/2223-5752.2012.3.19-26. Disponível em: https://jrnls.ivet.edu.ua/1/article/view/441. Acesso em: 10 jul. 2026.