OKUŁA, A.; KARCZMAREK-BOROWSKA, B. Carcinoembryonic antigen as a tumor marker in lung cancer – is it clinically useful?. European Journal of Clinical and Experimental Medicine, [S. l.], v. 16, n. 1, p. 53–59, 2018. DOI: 10.15584/ejcem.2018.1.9. Disponível em: https://journals.ur.edu.pl/ejcem/article/view/11698. Acesso em: 2 feb. 2026.