REICH, Edgar. Some Combinatorial Theorems for Continuous Parameter Processes. Mathematica Scandinavica, Berkeley, CA, United States, v. 9, p. 243–257, 1961. DOI: 10.7146/math.scand.a-10638. Disponível em: https://journals.msp.org/mscand/article/view/2707. Acesso em: 25 jul. 2026.