NJASTAD, Olav. Uniform Approximation in Various Function Classes. Mathematica Scandinavica, Berkeley, CA, United States, v. 14, p. 5–18, 1964. DOI: 10.7146/math.scand.a-10700. Disponível em: https://journals.msp.org/mscand/article/view/2604. Acesso em: 25 jul. 2026.