On the geometric properties of series in systems of functions. Neliniini Kolyvannya, [S. l.], v. 27, n. 1, p. 141–148, 2024. DOI: 10.3842/nosc.v27i1.1455. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1136. Acesso em: 6 dec. 2025.