1.
Akobirshoev MO, Shabozov MS. On exact values of quasiwidths for some classes of differentiable periodic functions of two variables. Ukr. Mat. Zhurn. [Internet]. 2009Jun.25 [cited 2024Apr.20];61(6):855-64. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3063