YESSENBAYEVA, G.A.; Yesbayev А.N.; POPPELL, H. On the inequality of different metrics for trigonometric polynomials. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 93, n. 1, p. 102–107, 2019. DOI: 10.31489/2019m1/102-107. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/293. Acesso em: 7 sep. 2025.