PREISS, David; TISER, Jaroslav. Positivity principle for more concentrated measures. Mathematica Scandinavica, Berkeley, CA, United States, v. 81, p. 236–246, 1997. DOI: 10.7146/math.scand.a-12877. Disponível em: https://journals.msp.org/mscand/article/view/1021. Acesso em: 25 jul. 2026.