BRODDA, Benny. On Uniqueness Theorems for Differential Equations With Constant Coefficients. Mathematica Scandinavica, Berkeley, CA, United States, v. 9, p. 55–68, 1961. DOI: 10.7146/math.scand.a-10622. Disponível em: https://journals.msp.org/mscand/article/view/2723. Acesso em: 25 jul. 2026.