BIRŠTUNAS, Adomas. Efficient decision procedure for Belief modality. Lietuvos matematikos rinkinys, [S. l.], v. 45, n. spec., p. 321–325, 2005. DOI: 10.15388/LMR.2005.26673. Disponível em: https://test.zurnalai.vu.lt/LMR/article/view/26673. Acesso em: 29 oct. 2025.