PLIUŠKEVIČIENĖ, Aida. Specialization of derivations in modal logic S5. Lietuvos matematikos rinkinys, [S. l.], v. 46, n. spec., p. 242–246, 2023. DOI: 10.15388/LMR.2006.30718. Disponível em: https://www.journals.vu.lt/LMR/article/view/30718.. Acesso em: 14 may. 2024.