Novikov O, Rovenska O. Approximation of the periodical functions of high smoothness by the rightangled Fourier sums. Carpathian Math. Publ. [Internet]. 2013 Jun. 20 [cited 2024 Nov. 22];5(1):102-9. Available from: https://ktipe.pnu.edu.ua/index.php/cmp/article/view/3657