Hembars’kaS. B. and ZadereiP. V. (2016) “Estimations of the integral of modulus for mixed derivatives of the sum of double trigonometric series”, Ukrains’kyi Matematychnyi Zhurnal, 68(7), pp. 908-921. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1890 (Accessed: 23November2024).