GRENNBERG, Anders. Sets of Divergence of Fourier Series. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 310–318, 1972. DOI: 10.7146/math.scand.a-11438. Disponível em: https://tidsskrift.dk/math/article/view/11438. Acesso em: 14 aug. 2026.