COHOON, D. K. Nonexistence of a Continuous Right Inverse for Linear Partial Differential Operators with Constant Coefficients. Mathematica Scandinavica, Berkeley, CA, United States, v. 29, p. 337–342, 1971. DOI: 10.7146/math.scand.a-11060. Disponível em: https://journals.msp.org/mscand/article/view/2294. Acesso em: 25 jul. 2026.