Tuxtamurodova, Tillohon. “Spectrum of the Sum of Partial Integral Operators Generated by Incomplete Orthonormal Systems”. «ACTA NUUz» 2, no. 2.1 (April 9, 2026): 130–136. Accessed April 30, 2026. http://journals.nuu.uz/index.php/actanuuz/article/view/11816.