IZUMI, Masako; IZUMI, Shin-ichi. On Some Trigonometrical Polynomials. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 38–44, 1967. DOI: 10.7146/math.scand.a-10842. Disponível em: https://journals.msp.org/mscand/article/view/2484. Acesso em: 25 jul. 2026.