HSIANG, F. C. On Some Extensions of Theorems of Fejér. MATHEMATICA SCANDINAVICA, [S. l.], v. 7, p. 333–336, 1959. DOI: 10.7146/math.scand.a-10578. Disponível em: https://www.mscand.dk/article/view/10578. Acesso em: 29 apr. 2024.