Baituyakova, Zh.Zh. “On a Necessary Condition for Belonging of a Function to Periodic Generalized Nikol’sky-Besov-Morrey Space in Terms of Strong Summability of Fourier Series”. Bulletin of the Karaganda University. Mathematics Series, vol. 83, no. 3, Sept. 2016, pp. 13-19, https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/89.