VALEVIČIUS, Vytautas. On Comparability of Theories. Problemos, [S. l.], v. 28, p. 58–62, 1982. DOI: 10.15388/Problemos.1982.28.6329. Disponível em: https://test.zurnalai.vu.lt/problemos/article/view/6329. Acesso em: 26 oct. 2025.