ASATRYAN, H. A. ON ONE FORMULA OF TRACES. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 44, n. 3 (223), p. 68–70, 2010. DOI: 10.46991/PYSUA.2010.44.3.068. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol_44_no3_2010_pp068-070. Acesso em: 21 jan. 2026.