KENDALL, David G. Bernstein polynomials and semigroups of operators. Mathematica Scandinavica, Berkeley, CA, United States, v. 2, p. 185–186, 1954. DOI: 10.7146/math.scand.a-10404. Disponível em: https://journals.msp.org/mscand/article/view/2917. Acesso em: 25 jul. 2026.