LASSER, R. A result on spectral synthesis of direct products. MATHEMATICA SCANDINAVICA, [S. l.], v. 44, p. 335–338, 1979. DOI: 10.7146/math.scand.a-11815. Disponível em: https://www.mscand.dk/article/view/11815. Acesso em: 1 may. 2024.