BABAYAN, J. A. ON A BIORTOGONAL SYSTEM OF MUNTS FUNCTION. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 36, n. 1 (197), p. 15–23, 2002. DOI: 10.46991/PYSUA.2002.36.1.015. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol36_no1_2002_pp015-023. Acesso em: 22 jan. 2026.