1.
Hembars’kaSB, Zaderei PV. Estimations of the integral of modulus for mixed derivatives of the sum of double trigonometric series. Ukr. Mat. Zhurn. [Internet]. 2016Jul.25 [cited 2024Dec.9];68(7):908-21. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1890