Romanyuk AS. On the Problem of Linear Widths of the Classes $B_{p,θ}^r$ of Periodic Functions of Many Variables. Ukr. Mat. Zhurn. [Internet]. 2014Jul.25 [cited 2024Apr.19];66(7):970–982. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2192