Babenko, V.F., Gun’ko, M.S. and Rudenko, A.A. (2014) “Optimal Recovery of n-Linear Functionals According to Linear Information”, Ukrains’kyi Matematychnyi Zhurnal, 66(7), pp. 884–890. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2186 (Accessed: 5 December 2025).