“Approximation of Functions from Isotropic Classes $B_{1,\theta}^{\Omega}(\mathbb{R}^d)$ to Integer Functions of Exponential Type”. Transactions of Institute of Mathematics, the NAS of Ukraine, vol. 10, no. 1, July 2013, pp. 169-83, https://trim.imath.kiev.ua/index.php/trim/article/view/162.