FLEISCHER, I.; KOOHARIAN, A. Complements to the Karhunen Representation. Mathematica Scandinavica, Berkeley, CA, United States, v. 9, p. 83–89, 1961. DOI: 10.7146/math.scand.a-10625. Disponível em: https://journals.msp.org/mscand/article/view/2716. Acesso em: 25 jul. 2026.