THOMPSON, Jan. On the Total Regularity of Function-to-Function Transformations of Triangular Type. Mathematica Scandinavica, Berkeley, CA, United States, v. 18, p. 19–22, 1966. DOI: 10.7146/math.scand.a-10775. Disponível em: https://journals.msp.org/mscand/article/view/2528. Acesso em: 25 jul. 2026.