“Estimates of the Orthogonal Widths of the Classes $B^{\Omega}_{\infty,\theta}$ of Periodic Functions of Many Variables With Given Majorant of the Mixed Moduli of Continuity”. 2015. Transactions of Institute of Mathematics, the NAS of Ukraine 12 (4): 205-15. https://trim.imath.kiev.ua/index.php/trim/article/view/294.