GODOY, T.; SAAL, L.; URCIUOLO, M. About Certain Singular Kernels $K(x,y) = K_1(x-y)K_2(x+y)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 74, p. 98–110, 1994. DOI: 10.7146/math.scand.a-12482. Disponível em: https://journals.msp.org/mscand/article/view/1146. Acesso em: 24 jul. 2026.