NUIJ, W. A Note on Hyperbolic Polynomials. MATHEMATICA SCANDINAVICA, [S. l.], v. 23, p. 69–72, 1968. DOI: 10.7146/math.scand.a-10898. Disponível em: https://www.mscand.dk/article/view/10898. Acesso em: 2 may. 2024.