PESKIR, G.; SCHNEIDER, D.; WEBER, M. Randomly Weighted Series of Contractions in Hilbert Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 79, p. 263–282, 1996. DOI: 10.7146/math.scand.a-12606. Disponível em: https://journals.msp.org/mscand/article/view/1066. Acesso em: 24 jul. 2026.