TOGHANYAN, V. H. SUBDIRECT INDECOMPOSABLE PARTIALLY COMMUTATIVE, NORMAL AND QUASI NORMAL ALGEBRAS. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 37, n. 2 (201), p. 30–37, 2003. DOI: 10.46991/PYSUA.2003.37.2.030. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol37_no2_2003_pp030-037. Acesso em: 22 jan. 2026.