LIU, Teng-sun; WANG, Ju-kwei. Sums and Intersections of Lebesgue Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 23, p. 241–251, 1968. DOI: 10.7146/math.scand.a-10916. Disponível em: https://www.mscand.dk/article/view/10916. Acesso em: 5 dec. 2025.