GODOY, T.; SAAL, L.; URCIUOLO, M. About Certain Singular Kernels $K(x,y) = K_1(x-y)K_2(x+y)$. MATHEMATICA SCANDINAVICA, [S. l.], v. 74, p. 98–110, 1994. DOI: 10.7146/math.scand.a-12482. Disponível em: https://tidsskrift.dk/math/article/view/12482. Acesso em: 14 aug. 2026.