MAŁECKI, J. Non-specific low back pain – what does it exactly mean? A proposed redefinition and classification of the problem. European Journal of Clinical and Experimental Medicine, [S. l.], v. 15, n. 4, p. 349–355, 2017. DOI: 10.15584/ejcem.2017.4.8. Disponível em: https://journals.ur.edu.pl/ejcem/article/view/11689. Acesso em: 2 feb. 2026.