BABENKO, V.; BABENKO, Yu.; PARFINOVYCH, N. Optimal recovery of mappings, optimal information operators, and extremal subspaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 7, p. 455–460, 2025. DOI: 10.3842/umzh.v77i7.8942. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8942. Acesso em: 5 dec. 2025.