Babenko VF, Gun’ko MS, Rudenko AA. Optimal Recovery of n-Linear Functionals According to Linear Information. Ukr. Mat. Zhurn. [Internet]. 2014 Jul. 25 [cited 2025 Dec. 5];66(7):884–890. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2186