“Ortho-projective widths of classes $B_{p,\theta}^\Omega$ of periodic functions of many variables in the space $L_q$”, ЗПІМ, vol. 10, no. 1, pp. 95–109, Jul. 2013, Accessed: Sep. 09, 2026. Available: https://trim.imath.kiev.ua/index.php/trim/article/view/141