TUXTAMURODOVA, Tillohon. Spectrum of the Sum of Partial Integral Operators Generated by Incomplete Orthonormal Systems. «ACTA NUUz», [S. l.], v. 2, n. 2.1, p. 130–136, 2026. Disponível em: http://journals.nuu.uz/index.php/actanuuz/article/view/11816. Acesso em: 30 apr. 2026.