BOLIBEKIAN, H. R. THREE-VALUED PREDICATE CALCULI WITH THE SYMBOL OF UNCERTAINTY. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 36, n. 2 (198), p. 44–50, 2002. DOI: 10.46991/PYSUA.2002.36.2.044. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol36_no2_2002_pp044-050. Acesso em: 22 jan. 2026.