Kuznetsovci, O.I. (1995) “Asymptotic behavior of Lebesgue functions of two variables”, Ukrains’kyi Matematychnyi Zhurnal, 47(2), pp. 220–226. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5406 (Accessed: 7 April 2025).