IZUMI, Masako; IZUMI, Shin-ichi. On Some Trigonometrical Polynomials. MATHEMATICA SCANDINAVICA, [S. l.], v. 21, p. 38–44, 1967. DOI: 10.7146/math.scand.a-10842. Disponível em: https://www.mscand.dk/article/view/10842. Acesso em: 15 feb. 2026.