LASSER, Rupert. A result on spectral synthesis of direct products. Mathematica Scandinavica, Berkeley, CA, United States, v. 44, p. 335–338, 1979. DOI: 10.7146/math.scand.a-11815. Disponível em: https://journals.msp.org/mscand/article/view/1833. Acesso em: 25 jul. 2026.