OGRODNIK, Bogdan. Towards a unified conception of nature. Conciderations on the basis of Popper’s conception of three worlds. Folia Philosophica, [S. l.], v. 24, p. 89–106, 2006. DOI: 10.31261/fp.20972. Disponível em: https://journals.us.edu.pl/index.php/FOLIA/article/view/20972. Acesso em: 2 feb. 2026.