HEINS, A. E.; BALDWIN, G. L. On the diffraction of a plane wave by an infinite plane grating. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 103–118, 1954. DOI: 10.7146/math.scand.a-10400. Disponível em: https://www.mscand.dk/article/view/10400. Acesso em: 7 may. 2024.