GUNKO, M. S.; BABENKO, V. F.; PARFINOVYCH, N. V. Optimal recovery of elements from Hilbert space and their scalar products by Fourier coefficients known with error. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 6, p. 736–750, 2020. DOI: 10.37863/umzh.v72i6.1107. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1107. Acesso em: 11 apr. 2025.